MAYBE
Time: 6.227089
TRS:
 {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
               mark isNatKind X -> active isNatKind X,
           mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                      mark tt() -> active tt(),
           mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
           mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
               mark U15(X1, X2) -> active U15(mark X1, X2),
                   mark isNat X -> active isNat X,
                     mark U16 X -> active U16 mark X,
               mark U22(X1, X2) -> active U22(mark X1, X2),
               mark U21(X1, X2) -> active U21(mark X1, X2),
                     mark U23 X -> active U23 mark X,
                     mark U32 X -> active U32 mark X,
               mark U31(X1, X2) -> active U31(mark X1, X2),
                     mark U41 X -> active U41 mark X,
               mark U52(X1, X2) -> active U52(mark X1, X2),
               mark U51(X1, X2) -> active U51(mark X1, X2),
           mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
           mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
           mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
           mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                       mark s X -> active s mark X,
              mark plus(X1, X2) -> active plus(mark X1, mark X2),
                       mark 0() -> active 0(),
           U12(X1, X2, mark X3) -> U12(X1, X2, X3),
         U12(X1, X2, active X3) -> U12(X1, X2, X3),
           U12(X1, mark X2, X3) -> U12(X1, X2, X3),
         U12(X1, active X2, X3) -> U12(X1, X2, X3),
           U12(mark X1, X2, X3) -> U12(X1, X2, X3),
         U12(active X1, X2, X3) -> U12(X1, X2, X3),
               isNatKind mark X -> isNatKind X,
             isNatKind active X -> isNatKind X,
       active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
          active isNatKind s V1 -> mark U41 isNatKind V1,
  active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
           active isNatKind 0() -> mark tt(),
       active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
       active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
       active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
           active U15(tt(), V2) -> mark U16 isNat V2,
              active isNat s V1 -> mark U21(isNatKind V1, V1),
      active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
               active isNat 0() -> mark tt(),
                active U16 tt() -> mark tt(),
           active U22(tt(), V1) -> mark U23 isNat V1,
           active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                active U23 tt() -> mark tt(),
                active U32 tt() -> mark tt(),
           active U31(tt(), V2) -> mark U32 isNatKind V2,
                active U41 tt() -> mark tt(),
            active U52(tt(), N) -> mark N,
            active U51(tt(), N) -> mark U52(isNatKind N, N),
         active U62(tt(), M, N) -> mark U63(isNat N, M, N),
         active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
         active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
         active U64(tt(), M, N) -> mark s plus(N, M),
            active plus(N, s M) -> mark U61(isNat M, M, N),
            active plus(N, 0()) -> mark U51(isNat N, N),
           U11(X1, X2, mark X3) -> U11(X1, X2, X3),
         U11(X1, X2, active X3) -> U11(X1, X2, X3),
           U11(X1, mark X2, X3) -> U11(X1, X2, X3),
         U11(X1, active X2, X3) -> U11(X1, X2, X3),
           U11(mark X1, X2, X3) -> U11(X1, X2, X3),
         U11(active X1, X2, X3) -> U11(X1, X2, X3),
           U13(X1, X2, mark X3) -> U13(X1, X2, X3),
         U13(X1, X2, active X3) -> U13(X1, X2, X3),
           U13(X1, mark X2, X3) -> U13(X1, X2, X3),
         U13(X1, active X2, X3) -> U13(X1, X2, X3),
           U13(mark X1, X2, X3) -> U13(X1, X2, X3),
         U13(active X1, X2, X3) -> U13(X1, X2, X3),
           U14(X1, X2, mark X3) -> U14(X1, X2, X3),
         U14(X1, X2, active X3) -> U14(X1, X2, X3),
           U14(X1, mark X2, X3) -> U14(X1, X2, X3),
         U14(X1, active X2, X3) -> U14(X1, X2, X3),
           U14(mark X1, X2, X3) -> U14(X1, X2, X3),
         U14(active X1, X2, X3) -> U14(X1, X2, X3),
               U15(X1, mark X2) -> U15(X1, X2),
             U15(X1, active X2) -> U15(X1, X2),
               U15(mark X1, X2) -> U15(X1, X2),
             U15(active X1, X2) -> U15(X1, X2),
                   isNat mark X -> isNat X,
                 isNat active X -> isNat X,
                     U16 mark X -> U16 X,
                   U16 active X -> U16 X,
               U22(X1, mark X2) -> U22(X1, X2),
             U22(X1, active X2) -> U22(X1, X2),
               U22(mark X1, X2) -> U22(X1, X2),
             U22(active X1, X2) -> U22(X1, X2),
               U21(X1, mark X2) -> U21(X1, X2),
             U21(X1, active X2) -> U21(X1, X2),
               U21(mark X1, X2) -> U21(X1, X2),
             U21(active X1, X2) -> U21(X1, X2),
                     U23 mark X -> U23 X,
                   U23 active X -> U23 X,
                     U32 mark X -> U32 X,
                   U32 active X -> U32 X,
               U31(X1, mark X2) -> U31(X1, X2),
             U31(X1, active X2) -> U31(X1, X2),
               U31(mark X1, X2) -> U31(X1, X2),
             U31(active X1, X2) -> U31(X1, X2),
                     U41 mark X -> U41 X,
                   U41 active X -> U41 X,
               U52(X1, mark X2) -> U52(X1, X2),
             U52(X1, active X2) -> U52(X1, X2),
               U52(mark X1, X2) -> U52(X1, X2),
             U52(active X1, X2) -> U52(X1, X2),
               U51(X1, mark X2) -> U51(X1, X2),
             U51(X1, active X2) -> U51(X1, X2),
               U51(mark X1, X2) -> U51(X1, X2),
             U51(active X1, X2) -> U51(X1, X2),
           U62(X1, X2, mark X3) -> U62(X1, X2, X3),
         U62(X1, X2, active X3) -> U62(X1, X2, X3),
           U62(X1, mark X2, X3) -> U62(X1, X2, X3),
         U62(X1, active X2, X3) -> U62(X1, X2, X3),
           U62(mark X1, X2, X3) -> U62(X1, X2, X3),
         U62(active X1, X2, X3) -> U62(X1, X2, X3),
           U61(X1, X2, mark X3) -> U61(X1, X2, X3),
         U61(X1, X2, active X3) -> U61(X1, X2, X3),
           U61(X1, mark X2, X3) -> U61(X1, X2, X3),
         U61(X1, active X2, X3) -> U61(X1, X2, X3),
           U61(mark X1, X2, X3) -> U61(X1, X2, X3),
         U61(active X1, X2, X3) -> U61(X1, X2, X3),
           U63(X1, X2, mark X3) -> U63(X1, X2, X3),
         U63(X1, X2, active X3) -> U63(X1, X2, X3),
           U63(X1, mark X2, X3) -> U63(X1, X2, X3),
         U63(X1, active X2, X3) -> U63(X1, X2, X3),
           U63(mark X1, X2, X3) -> U63(X1, X2, X3),
         U63(active X1, X2, X3) -> U63(X1, X2, X3),
           U64(X1, X2, mark X3) -> U64(X1, X2, X3),
         U64(X1, X2, active X3) -> U64(X1, X2, X3),
           U64(X1, mark X2, X3) -> U64(X1, X2, X3),
         U64(X1, active X2, X3) -> U64(X1, X2, X3),
           U64(mark X1, X2, X3) -> U64(X1, X2, X3),
         U64(active X1, X2, X3) -> U64(X1, X2, X3),
                       s mark X -> s X,
                     s active X -> s X,
              plus(X1, mark X2) -> plus(X1, X2),
            plus(X1, active X2) -> plus(X1, X2),
              plus(mark X1, X2) -> plus(X1, X2),
            plus(active X1, X2) -> plus(X1, X2)}
 DP:
  DP:
   {
             mark# U12(X1, X2, X3) -> mark# X1,
             mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3),
             mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3),
                 mark# isNatKind X -> active# isNatKind X,
             mark# U11(X1, X2, X3) -> mark# X1,
             mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3),
             mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3),
                        mark# tt() -> active# tt(),
             mark# U13(X1, X2, X3) -> mark# X1,
             mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3),
             mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3),
             mark# U14(X1, X2, X3) -> mark# X1,
             mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3),
             mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3),
                 mark# U15(X1, X2) -> mark# X1,
                 mark# U15(X1, X2) -> active# U15(mark X1, X2),
                 mark# U15(X1, X2) -> U15#(mark X1, X2),
                     mark# isNat X -> active# isNat X,
                       mark# U16 X -> mark# X,
                       mark# U16 X -> active# U16 mark X,
                       mark# U16 X -> U16# mark X,
                 mark# U22(X1, X2) -> mark# X1,
                 mark# U22(X1, X2) -> active# U22(mark X1, X2),
                 mark# U22(X1, X2) -> U22#(mark X1, X2),
                 mark# U21(X1, X2) -> mark# X1,
                 mark# U21(X1, X2) -> active# U21(mark X1, X2),
                 mark# U21(X1, X2) -> U21#(mark X1, X2),
                       mark# U23 X -> mark# X,
                       mark# U23 X -> active# U23 mark X,
                       mark# U23 X -> U23# mark X,
                       mark# U32 X -> mark# X,
                       mark# U32 X -> active# U32 mark X,
                       mark# U32 X -> U32# mark X,
                 mark# U31(X1, X2) -> mark# X1,
                 mark# U31(X1, X2) -> active# U31(mark X1, X2),
                 mark# U31(X1, X2) -> U31#(mark X1, X2),
                       mark# U41 X -> mark# X,
                       mark# U41 X -> active# U41 mark X,
                       mark# U41 X -> U41# mark X,
                 mark# U52(X1, X2) -> mark# X1,
                 mark# U52(X1, X2) -> active# U52(mark X1, X2),
                 mark# U52(X1, X2) -> U52#(mark X1, X2),
                 mark# U51(X1, X2) -> mark# X1,
                 mark# U51(X1, X2) -> active# U51(mark X1, X2),
                 mark# U51(X1, X2) -> U51#(mark X1, X2),
             mark# U62(X1, X2, X3) -> mark# X1,
             mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3),
             mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3),
             mark# U61(X1, X2, X3) -> mark# X1,
             mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3),
             mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3),
             mark# U63(X1, X2, X3) -> mark# X1,
             mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3),
             mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3),
             mark# U64(X1, X2, X3) -> mark# X1,
             mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3),
             mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3),
                         mark# s X -> mark# X,
                         mark# s X -> active# s mark X,
                         mark# s X -> s# mark X,
                mark# plus(X1, X2) -> mark# X1,
                mark# plus(X1, X2) -> mark# X2,
                mark# plus(X1, X2) -> active# plus(mark X1, mark X2),
                mark# plus(X1, X2) -> plus#(mark X1, mark X2),
                         mark# 0() -> active# 0(),
             U12#(X1, X2, mark X3) -> U12#(X1, X2, X3),
           U12#(X1, X2, active X3) -> U12#(X1, X2, X3),
             U12#(X1, mark X2, X3) -> U12#(X1, X2, X3),
           U12#(X1, active X2, X3) -> U12#(X1, X2, X3),
             U12#(mark X1, X2, X3) -> U12#(X1, X2, X3),
           U12#(active X1, X2, X3) -> U12#(X1, X2, X3),
                 isNatKind# mark X -> isNatKind# X,
               isNatKind# active X -> isNatKind# X,
         active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2),
         active# U12(tt(), V1, V2) -> isNatKind# V2,
         active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2),
            active# isNatKind s V1 -> mark# U41 isNatKind V1,
            active# isNatKind s V1 -> isNatKind# V1,
            active# isNatKind s V1 -> U41# isNatKind V1,
    active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2),
    active# isNatKind plus(V1, V2) -> isNatKind# V1,
    active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2),
             active# isNatKind 0() -> mark# tt(),
         active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2),
         active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2),
         active# U11(tt(), V1, V2) -> isNatKind# V1,
         active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2),
         active# U13(tt(), V1, V2) -> isNatKind# V2,
         active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2),
         active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2),
         active# U14(tt(), V1, V2) -> U15#(isNat V1, V2),
         active# U14(tt(), V1, V2) -> isNat# V1,
             active# U15(tt(), V2) -> mark# U16 isNat V2,
             active# U15(tt(), V2) -> isNat# V2,
             active# U15(tt(), V2) -> U16# isNat V2,
                active# isNat s V1 -> mark# U21(isNatKind V1, V1),
                active# isNat s V1 -> isNatKind# V1,
                active# isNat s V1 -> U21#(isNatKind V1, V1),
        active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2),
        active# isNat plus(V1, V2) -> isNatKind# V1,
        active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2),
                 active# isNat 0() -> mark# tt(),
                  active# U16 tt() -> mark# tt(),
             active# U22(tt(), V1) -> mark# U23 isNat V1,
             active# U22(tt(), V1) -> isNat# V1,
             active# U22(tt(), V1) -> U23# isNat V1,
             active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1),
             active# U21(tt(), V1) -> isNatKind# V1,
             active# U21(tt(), V1) -> U22#(isNatKind V1, V1),
                  active# U23 tt() -> mark# tt(),
                  active# U32 tt() -> mark# tt(),
             active# U31(tt(), V2) -> mark# U32 isNatKind V2,
             active# U31(tt(), V2) -> isNatKind# V2,
             active# U31(tt(), V2) -> U32# isNatKind V2,
                  active# U41 tt() -> mark# tt(),
              active# U52(tt(), N) -> mark# N,
              active# U51(tt(), N) -> mark# U52(isNatKind N, N),
              active# U51(tt(), N) -> isNatKind# N,
              active# U51(tt(), N) -> U52#(isNatKind N, N),
           active# U62(tt(), M, N) -> mark# U63(isNat N, M, N),
           active# U62(tt(), M, N) -> isNat# N,
           active# U62(tt(), M, N) -> U63#(isNat N, M, N),
           active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N),
           active# U61(tt(), M, N) -> isNatKind# M,
           active# U61(tt(), M, N) -> U62#(isNatKind M, M, N),
           active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N),
           active# U63(tt(), M, N) -> isNatKind# N,
           active# U63(tt(), M, N) -> U64#(isNatKind N, M, N),
           active# U64(tt(), M, N) -> mark# s plus(N, M),
           active# U64(tt(), M, N) -> s# plus(N, M),
           active# U64(tt(), M, N) -> plus#(N, M),
              active# plus(N, s M) -> mark# U61(isNat M, M, N),
              active# plus(N, s M) -> isNat# M,
              active# plus(N, s M) -> U61#(isNat M, M, N),
              active# plus(N, 0()) -> mark# U51(isNat N, N),
              active# plus(N, 0()) -> isNat# N,
              active# plus(N, 0()) -> U51#(isNat N, N),
             U11#(X1, X2, mark X3) -> U11#(X1, X2, X3),
           U11#(X1, X2, active X3) -> U11#(X1, X2, X3),
             U11#(X1, mark X2, X3) -> U11#(X1, X2, X3),
           U11#(X1, active X2, X3) -> U11#(X1, X2, X3),
             U11#(mark X1, X2, X3) -> U11#(X1, X2, X3),
           U11#(active X1, X2, X3) -> U11#(X1, X2, X3),
             U13#(X1, X2, mark X3) -> U13#(X1, X2, X3),
           U13#(X1, X2, active X3) -> U13#(X1, X2, X3),
             U13#(X1, mark X2, X3) -> U13#(X1, X2, X3),
           U13#(X1, active X2, X3) -> U13#(X1, X2, X3),
             U13#(mark X1, X2, X3) -> U13#(X1, X2, X3),
           U13#(active X1, X2, X3) -> U13#(X1, X2, X3),
             U14#(X1, X2, mark X3) -> U14#(X1, X2, X3),
           U14#(X1, X2, active X3) -> U14#(X1, X2, X3),
             U14#(X1, mark X2, X3) -> U14#(X1, X2, X3),
           U14#(X1, active X2, X3) -> U14#(X1, X2, X3),
             U14#(mark X1, X2, X3) -> U14#(X1, X2, X3),
           U14#(active X1, X2, X3) -> U14#(X1, X2, X3),
                 U15#(X1, mark X2) -> U15#(X1, X2),
               U15#(X1, active X2) -> U15#(X1, X2),
                 U15#(mark X1, X2) -> U15#(X1, X2),
               U15#(active X1, X2) -> U15#(X1, X2),
                     isNat# mark X -> isNat# X,
                   isNat# active X -> isNat# X,
                       U16# mark X -> U16# X,
                     U16# active X -> U16# X,
                 U22#(X1, mark X2) -> U22#(X1, X2),
               U22#(X1, active X2) -> U22#(X1, X2),
                 U22#(mark X1, X2) -> U22#(X1, X2),
               U22#(active X1, X2) -> U22#(X1, X2),
                 U21#(X1, mark X2) -> U21#(X1, X2),
               U21#(X1, active X2) -> U21#(X1, X2),
                 U21#(mark X1, X2) -> U21#(X1, X2),
               U21#(active X1, X2) -> U21#(X1, X2),
                       U23# mark X -> U23# X,
                     U23# active X -> U23# X,
                       U32# mark X -> U32# X,
                     U32# active X -> U32# X,
                 U31#(X1, mark X2) -> U31#(X1, X2),
               U31#(X1, active X2) -> U31#(X1, X2),
                 U31#(mark X1, X2) -> U31#(X1, X2),
               U31#(active X1, X2) -> U31#(X1, X2),
                       U41# mark X -> U41# X,
                     U41# active X -> U41# X,
                 U52#(X1, mark X2) -> U52#(X1, X2),
               U52#(X1, active X2) -> U52#(X1, X2),
                 U52#(mark X1, X2) -> U52#(X1, X2),
               U52#(active X1, X2) -> U52#(X1, X2),
                 U51#(X1, mark X2) -> U51#(X1, X2),
               U51#(X1, active X2) -> U51#(X1, X2),
                 U51#(mark X1, X2) -> U51#(X1, X2),
               U51#(active X1, X2) -> U51#(X1, X2),
             U62#(X1, X2, mark X3) -> U62#(X1, X2, X3),
           U62#(X1, X2, active X3) -> U62#(X1, X2, X3),
             U62#(X1, mark X2, X3) -> U62#(X1, X2, X3),
           U62#(X1, active X2, X3) -> U62#(X1, X2, X3),
             U62#(mark X1, X2, X3) -> U62#(X1, X2, X3),
           U62#(active X1, X2, X3) -> U62#(X1, X2, X3),
             U61#(X1, X2, mark X3) -> U61#(X1, X2, X3),
           U61#(X1, X2, active X3) -> U61#(X1, X2, X3),
             U61#(X1, mark X2, X3) -> U61#(X1, X2, X3),
           U61#(X1, active X2, X3) -> U61#(X1, X2, X3),
             U61#(mark X1, X2, X3) -> U61#(X1, X2, X3),
           U61#(active X1, X2, X3) -> U61#(X1, X2, X3),
             U63#(X1, X2, mark X3) -> U63#(X1, X2, X3),
           U63#(X1, X2, active X3) -> U63#(X1, X2, X3),
             U63#(X1, mark X2, X3) -> U63#(X1, X2, X3),
           U63#(X1, active X2, X3) -> U63#(X1, X2, X3),
             U63#(mark X1, X2, X3) -> U63#(X1, X2, X3),
           U63#(active X1, X2, X3) -> U63#(X1, X2, X3),
             U64#(X1, X2, mark X3) -> U64#(X1, X2, X3),
           U64#(X1, X2, active X3) -> U64#(X1, X2, X3),
             U64#(X1, mark X2, X3) -> U64#(X1, X2, X3),
           U64#(X1, active X2, X3) -> U64#(X1, X2, X3),
             U64#(mark X1, X2, X3) -> U64#(X1, X2, X3),
           U64#(active X1, X2, X3) -> U64#(X1, X2, X3),
                         s# mark X -> s# X,
                       s# active X -> s# X,
                plus#(X1, mark X2) -> plus#(X1, X2),
              plus#(X1, active X2) -> plus#(X1, X2),
                plus#(mark X1, X2) -> plus#(X1, X2),
              plus#(active X1, X2) -> plus#(X1, X2)
   }
  TRS:
  {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                mark isNatKind X -> active isNatKind X,
            mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                       mark tt() -> active tt(),
            mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
            mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                mark U15(X1, X2) -> active U15(mark X1, X2),
                    mark isNat X -> active isNat X,
                      mark U16 X -> active U16 mark X,
                mark U22(X1, X2) -> active U22(mark X1, X2),
                mark U21(X1, X2) -> active U21(mark X1, X2),
                      mark U23 X -> active U23 mark X,
                      mark U32 X -> active U32 mark X,
                mark U31(X1, X2) -> active U31(mark X1, X2),
                      mark U41 X -> active U41 mark X,
                mark U52(X1, X2) -> active U52(mark X1, X2),
                mark U51(X1, X2) -> active U51(mark X1, X2),
            mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
            mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
            mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
            mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                        mark s X -> active s mark X,
               mark plus(X1, X2) -> active plus(mark X1, mark X2),
                        mark 0() -> active 0(),
            U12(X1, X2, mark X3) -> U12(X1, X2, X3),
          U12(X1, X2, active X3) -> U12(X1, X2, X3),
            U12(X1, mark X2, X3) -> U12(X1, X2, X3),
          U12(X1, active X2, X3) -> U12(X1, X2, X3),
            U12(mark X1, X2, X3) -> U12(X1, X2, X3),
          U12(active X1, X2, X3) -> U12(X1, X2, X3),
                isNatKind mark X -> isNatKind X,
              isNatKind active X -> isNatKind X,
        active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
           active isNatKind s V1 -> mark U41 isNatKind V1,
   active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
            active isNatKind 0() -> mark tt(),
        active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
        active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
        active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
            active U15(tt(), V2) -> mark U16 isNat V2,
               active isNat s V1 -> mark U21(isNatKind V1, V1),
       active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                active isNat 0() -> mark tt(),
                 active U16 tt() -> mark tt(),
            active U22(tt(), V1) -> mark U23 isNat V1,
            active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                 active U23 tt() -> mark tt(),
                 active U32 tt() -> mark tt(),
            active U31(tt(), V2) -> mark U32 isNatKind V2,
                 active U41 tt() -> mark tt(),
             active U52(tt(), N) -> mark N,
             active U51(tt(), N) -> mark U52(isNatKind N, N),
          active U62(tt(), M, N) -> mark U63(isNat N, M, N),
          active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
          active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
          active U64(tt(), M, N) -> mark s plus(N, M),
             active plus(N, s M) -> mark U61(isNat M, M, N),
             active plus(N, 0()) -> mark U51(isNat N, N),
            U11(X1, X2, mark X3) -> U11(X1, X2, X3),
          U11(X1, X2, active X3) -> U11(X1, X2, X3),
            U11(X1, mark X2, X3) -> U11(X1, X2, X3),
          U11(X1, active X2, X3) -> U11(X1, X2, X3),
            U11(mark X1, X2, X3) -> U11(X1, X2, X3),
          U11(active X1, X2, X3) -> U11(X1, X2, X3),
            U13(X1, X2, mark X3) -> U13(X1, X2, X3),
          U13(X1, X2, active X3) -> U13(X1, X2, X3),
            U13(X1, mark X2, X3) -> U13(X1, X2, X3),
          U13(X1, active X2, X3) -> U13(X1, X2, X3),
            U13(mark X1, X2, X3) -> U13(X1, X2, X3),
          U13(active X1, X2, X3) -> U13(X1, X2, X3),
            U14(X1, X2, mark X3) -> U14(X1, X2, X3),
          U14(X1, X2, active X3) -> U14(X1, X2, X3),
            U14(X1, mark X2, X3) -> U14(X1, X2, X3),
          U14(X1, active X2, X3) -> U14(X1, X2, X3),
            U14(mark X1, X2, X3) -> U14(X1, X2, X3),
          U14(active X1, X2, X3) -> U14(X1, X2, X3),
                U15(X1, mark X2) -> U15(X1, X2),
              U15(X1, active X2) -> U15(X1, X2),
                U15(mark X1, X2) -> U15(X1, X2),
              U15(active X1, X2) -> U15(X1, X2),
                    isNat mark X -> isNat X,
                  isNat active X -> isNat X,
                      U16 mark X -> U16 X,
                    U16 active X -> U16 X,
                U22(X1, mark X2) -> U22(X1, X2),
              U22(X1, active X2) -> U22(X1, X2),
                U22(mark X1, X2) -> U22(X1, X2),
              U22(active X1, X2) -> U22(X1, X2),
                U21(X1, mark X2) -> U21(X1, X2),
              U21(X1, active X2) -> U21(X1, X2),
                U21(mark X1, X2) -> U21(X1, X2),
              U21(active X1, X2) -> U21(X1, X2),
                      U23 mark X -> U23 X,
                    U23 active X -> U23 X,
                      U32 mark X -> U32 X,
                    U32 active X -> U32 X,
                U31(X1, mark X2) -> U31(X1, X2),
              U31(X1, active X2) -> U31(X1, X2),
                U31(mark X1, X2) -> U31(X1, X2),
              U31(active X1, X2) -> U31(X1, X2),
                      U41 mark X -> U41 X,
                    U41 active X -> U41 X,
                U52(X1, mark X2) -> U52(X1, X2),
              U52(X1, active X2) -> U52(X1, X2),
                U52(mark X1, X2) -> U52(X1, X2),
              U52(active X1, X2) -> U52(X1, X2),
                U51(X1, mark X2) -> U51(X1, X2),
              U51(X1, active X2) -> U51(X1, X2),
                U51(mark X1, X2) -> U51(X1, X2),
              U51(active X1, X2) -> U51(X1, X2),
            U62(X1, X2, mark X3) -> U62(X1, X2, X3),
          U62(X1, X2, active X3) -> U62(X1, X2, X3),
            U62(X1, mark X2, X3) -> U62(X1, X2, X3),
          U62(X1, active X2, X3) -> U62(X1, X2, X3),
            U62(mark X1, X2, X3) -> U62(X1, X2, X3),
          U62(active X1, X2, X3) -> U62(X1, X2, X3),
            U61(X1, X2, mark X3) -> U61(X1, X2, X3),
          U61(X1, X2, active X3) -> U61(X1, X2, X3),
            U61(X1, mark X2, X3) -> U61(X1, X2, X3),
          U61(X1, active X2, X3) -> U61(X1, X2, X3),
            U61(mark X1, X2, X3) -> U61(X1, X2, X3),
          U61(active X1, X2, X3) -> U61(X1, X2, X3),
            U63(X1, X2, mark X3) -> U63(X1, X2, X3),
          U63(X1, X2, active X3) -> U63(X1, X2, X3),
            U63(X1, mark X2, X3) -> U63(X1, X2, X3),
          U63(X1, active X2, X3) -> U63(X1, X2, X3),
            U63(mark X1, X2, X3) -> U63(X1, X2, X3),
          U63(active X1, X2, X3) -> U63(X1, X2, X3),
            U64(X1, X2, mark X3) -> U64(X1, X2, X3),
          U64(X1, X2, active X3) -> U64(X1, X2, X3),
            U64(X1, mark X2, X3) -> U64(X1, X2, X3),
          U64(X1, active X2, X3) -> U64(X1, X2, X3),
            U64(mark X1, X2, X3) -> U64(X1, X2, X3),
          U64(active X1, X2, X3) -> U64(X1, X2, X3),
                        s mark X -> s X,
                      s active X -> s X,
               plus(X1, mark X2) -> plus(X1, X2),
             plus(X1, active X2) -> plus(X1, X2),
               plus(mark X1, X2) -> plus(X1, X2),
             plus(active X1, X2) -> plus(X1, X2)}
  UR:
   {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                 mark isNatKind X -> active isNatKind X,
             mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                        mark tt() -> active tt(),
             mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
             mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                 mark U15(X1, X2) -> active U15(mark X1, X2),
                     mark isNat X -> active isNat X,
                       mark U16 X -> active U16 mark X,
                 mark U22(X1, X2) -> active U22(mark X1, X2),
                 mark U21(X1, X2) -> active U21(mark X1, X2),
                       mark U23 X -> active U23 mark X,
                       mark U32 X -> active U32 mark X,
                 mark U31(X1, X2) -> active U31(mark X1, X2),
                       mark U41 X -> active U41 mark X,
                 mark U52(X1, X2) -> active U52(mark X1, X2),
                 mark U51(X1, X2) -> active U51(mark X1, X2),
             mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
             mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
             mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
             mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                         mark s X -> active s mark X,
                mark plus(X1, X2) -> active plus(mark X1, mark X2),
                         mark 0() -> active 0(),
             U12(X1, X2, mark X3) -> U12(X1, X2, X3),
           U12(X1, X2, active X3) -> U12(X1, X2, X3),
             U12(X1, mark X2, X3) -> U12(X1, X2, X3),
           U12(X1, active X2, X3) -> U12(X1, X2, X3),
             U12(mark X1, X2, X3) -> U12(X1, X2, X3),
           U12(active X1, X2, X3) -> U12(X1, X2, X3),
                 isNatKind mark X -> isNatKind X,
               isNatKind active X -> isNatKind X,
         active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
            active isNatKind s V1 -> mark U41 isNatKind V1,
    active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
             active isNatKind 0() -> mark tt(),
         active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
         active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
         active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
             active U15(tt(), V2) -> mark U16 isNat V2,
                active isNat s V1 -> mark U21(isNatKind V1, V1),
        active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                 active isNat 0() -> mark tt(),
                  active U16 tt() -> mark tt(),
             active U22(tt(), V1) -> mark U23 isNat V1,
             active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                  active U23 tt() -> mark tt(),
                  active U32 tt() -> mark tt(),
             active U31(tt(), V2) -> mark U32 isNatKind V2,
                  active U41 tt() -> mark tt(),
              active U52(tt(), N) -> mark N,
              active U51(tt(), N) -> mark U52(isNatKind N, N),
           active U62(tt(), M, N) -> mark U63(isNat N, M, N),
           active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
           active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
           active U64(tt(), M, N) -> mark s plus(N, M),
              active plus(N, s M) -> mark U61(isNat M, M, N),
              active plus(N, 0()) -> mark U51(isNat N, N),
             U11(X1, X2, mark X3) -> U11(X1, X2, X3),
           U11(X1, X2, active X3) -> U11(X1, X2, X3),
             U11(X1, mark X2, X3) -> U11(X1, X2, X3),
           U11(X1, active X2, X3) -> U11(X1, X2, X3),
             U11(mark X1, X2, X3) -> U11(X1, X2, X3),
           U11(active X1, X2, X3) -> U11(X1, X2, X3),
             U13(X1, X2, mark X3) -> U13(X1, X2, X3),
           U13(X1, X2, active X3) -> U13(X1, X2, X3),
             U13(X1, mark X2, X3) -> U13(X1, X2, X3),
           U13(X1, active X2, X3) -> U13(X1, X2, X3),
             U13(mark X1, X2, X3) -> U13(X1, X2, X3),
           U13(active X1, X2, X3) -> U13(X1, X2, X3),
             U14(X1, X2, mark X3) -> U14(X1, X2, X3),
           U14(X1, X2, active X3) -> U14(X1, X2, X3),
             U14(X1, mark X2, X3) -> U14(X1, X2, X3),
           U14(X1, active X2, X3) -> U14(X1, X2, X3),
             U14(mark X1, X2, X3) -> U14(X1, X2, X3),
           U14(active X1, X2, X3) -> U14(X1, X2, X3),
                 U15(X1, mark X2) -> U15(X1, X2),
               U15(X1, active X2) -> U15(X1, X2),
                 U15(mark X1, X2) -> U15(X1, X2),
               U15(active X1, X2) -> U15(X1, X2),
                     isNat mark X -> isNat X,
                   isNat active X -> isNat X,
                       U16 mark X -> U16 X,
                     U16 active X -> U16 X,
                 U22(X1, mark X2) -> U22(X1, X2),
               U22(X1, active X2) -> U22(X1, X2),
                 U22(mark X1, X2) -> U22(X1, X2),
               U22(active X1, X2) -> U22(X1, X2),
                 U21(X1, mark X2) -> U21(X1, X2),
               U21(X1, active X2) -> U21(X1, X2),
                 U21(mark X1, X2) -> U21(X1, X2),
               U21(active X1, X2) -> U21(X1, X2),
                       U23 mark X -> U23 X,
                     U23 active X -> U23 X,
                       U32 mark X -> U32 X,
                     U32 active X -> U32 X,
                 U31(X1, mark X2) -> U31(X1, X2),
               U31(X1, active X2) -> U31(X1, X2),
                 U31(mark X1, X2) -> U31(X1, X2),
               U31(active X1, X2) -> U31(X1, X2),
                       U41 mark X -> U41 X,
                     U41 active X -> U41 X,
                 U52(X1, mark X2) -> U52(X1, X2),
               U52(X1, active X2) -> U52(X1, X2),
                 U52(mark X1, X2) -> U52(X1, X2),
               U52(active X1, X2) -> U52(X1, X2),
                 U51(X1, mark X2) -> U51(X1, X2),
               U51(X1, active X2) -> U51(X1, X2),
                 U51(mark X1, X2) -> U51(X1, X2),
               U51(active X1, X2) -> U51(X1, X2),
             U62(X1, X2, mark X3) -> U62(X1, X2, X3),
           U62(X1, X2, active X3) -> U62(X1, X2, X3),
             U62(X1, mark X2, X3) -> U62(X1, X2, X3),
           U62(X1, active X2, X3) -> U62(X1, X2, X3),
             U62(mark X1, X2, X3) -> U62(X1, X2, X3),
           U62(active X1, X2, X3) -> U62(X1, X2, X3),
             U61(X1, X2, mark X3) -> U61(X1, X2, X3),
           U61(X1, X2, active X3) -> U61(X1, X2, X3),
             U61(X1, mark X2, X3) -> U61(X1, X2, X3),
           U61(X1, active X2, X3) -> U61(X1, X2, X3),
             U61(mark X1, X2, X3) -> U61(X1, X2, X3),
           U61(active X1, X2, X3) -> U61(X1, X2, X3),
             U63(X1, X2, mark X3) -> U63(X1, X2, X3),
           U63(X1, X2, active X3) -> U63(X1, X2, X3),
             U63(X1, mark X2, X3) -> U63(X1, X2, X3),
           U63(X1, active X2, X3) -> U63(X1, X2, X3),
             U63(mark X1, X2, X3) -> U63(X1, X2, X3),
           U63(active X1, X2, X3) -> U63(X1, X2, X3),
             U64(X1, X2, mark X3) -> U64(X1, X2, X3),
           U64(X1, X2, active X3) -> U64(X1, X2, X3),
             U64(X1, mark X2, X3) -> U64(X1, X2, X3),
           U64(X1, active X2, X3) -> U64(X1, X2, X3),
             U64(mark X1, X2, X3) -> U64(X1, X2, X3),
           U64(active X1, X2, X3) -> U64(X1, X2, X3),
                         s mark X -> s X,
                       s active X -> s X,
                plus(X1, mark X2) -> plus(X1, X2),
              plus(X1, active X2) -> plus(X1, X2),
                plus(mark X1, X2) -> plus(X1, X2),
              plus(active X1, X2) -> plus(X1, X2)}
   EDG:
    {
     (active# U14(tt(), V1, V2) -> U15#(isNat V1, V2), U15#(active X1, X2) -> U15#(X1, X2))
     (active# U14(tt(), V1, V2) -> U15#(isNat V1, V2), U15#(mark X1, X2) -> U15#(X1, X2))
     (active# isNat 0() -> mark# tt(), mark# tt() -> active# tt())
     (active# U23 tt() -> mark# tt(), mark# tt() -> active# tt())
     (active# U41 tt() -> mark# tt(), mark# tt() -> active# tt())
     (active# U51(tt(), N) -> U52#(isNatKind N, N), U52#(active X1, X2) -> U52#(X1, X2))
     (active# U51(tt(), N) -> U52#(isNatKind N, N), U52#(mark X1, X2) -> U52#(X1, X2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# plus(N, 0()) -> isNat# N)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# plus(N, s M) -> isNat# M)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U62(tt(), M, N) -> isNat# N)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U51(tt(), N) -> isNatKind# N)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U52(tt(), N) -> mark# N)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U41 tt() -> mark# tt())
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U32 tt() -> mark# tt())
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U23 tt() -> mark# tt())
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U22(tt(), V1) -> isNat# V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U16 tt() -> mark# tt())
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNat 0() -> mark# tt())
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNat s V1 -> isNatKind# V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U15(tt(), V2) -> isNat# V2)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNatKind 0() -> mark# tt())
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U15(X1, X2) -> active# U15(mark X1, X2), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# plus(N, 0()) -> isNat# N)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# plus(N, s M) -> isNat# M)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U62(tt(), M, N) -> isNat# N)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U51(tt(), N) -> isNatKind# N)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U52(tt(), N) -> mark# N)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U41 tt() -> mark# tt())
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U32 tt() -> mark# tt())
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U23 tt() -> mark# tt())
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U22(tt(), V1) -> isNat# V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U16 tt() -> mark# tt())
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNat 0() -> mark# tt())
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNat s V1 -> isNatKind# V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U15(tt(), V2) -> isNat# V2)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNatKind 0() -> mark# tt())
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U21(X1, X2) -> active# U21(mark X1, X2), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# plus(N, 0()) -> isNat# N)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# plus(N, s M) -> isNat# M)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U62(tt(), M, N) -> isNat# N)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U51(tt(), N) -> isNatKind# N)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U52(tt(), N) -> mark# N)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U41 tt() -> mark# tt())
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U32 tt() -> mark# tt())
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U23 tt() -> mark# tt())
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U22(tt(), V1) -> isNat# V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U16 tt() -> mark# tt())
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNat 0() -> mark# tt())
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNat s V1 -> isNatKind# V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U15(tt(), V2) -> isNat# V2)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNatKind 0() -> mark# tt())
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U52(X1, X2) -> active# U52(mark X1, X2), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# plus(X1, X2) -> mark# X2)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# plus(X1, X2) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# s X -> s# mark X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# s X -> active# s mark X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# s X -> mark# X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U64(X1, X2, X3) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U63(X1, X2, X3) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U61(X1, X2, X3) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U62(X1, X2, X3) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U51(X1, X2) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U52(X1, X2) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U41 X -> U41# mark X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U41 X -> active# U41 mark X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U41 X -> mark# X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U31(X1, X2) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U32 X -> U32# mark X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U32 X -> active# U32 mark X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U32 X -> mark# X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U23 X -> U23# mark X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U23 X -> active# U23 mark X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U23 X -> mark# X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U21(X1, X2) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U22(X1, X2) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U16 X -> U16# mark X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U16 X -> active# U16 mark X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U16 X -> mark# X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# isNat X -> active# isNat X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U15(X1, X2) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U14(X1, X2, X3) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U13(X1, X2, X3) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U11(X1, X2, X3) -> mark# X1)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# isNatKind X -> active# isNatKind X)
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2), mark# U12(X1, X2, X3) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# plus(X1, X2) -> mark# X2)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# plus(X1, X2) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# s X -> s# mark X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# s X -> active# s mark X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# s X -> mark# X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U64(X1, X2, X3) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U63(X1, X2, X3) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U61(X1, X2, X3) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U62(X1, X2, X3) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U51(X1, X2) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U52(X1, X2) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U41 X -> U41# mark X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U41 X -> active# U41 mark X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U41 X -> mark# X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U31(X1, X2) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U32 X -> U32# mark X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U32 X -> active# U32 mark X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U32 X -> mark# X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U23 X -> U23# mark X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U23 X -> active# U23 mark X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U23 X -> mark# X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U21(X1, X2) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U22(X1, X2) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U16 X -> U16# mark X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U16 X -> active# U16 mark X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U16 X -> mark# X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# isNat X -> active# isNat X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U15(X1, X2) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U14(X1, X2, X3) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U13(X1, X2, X3) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U11(X1, X2, X3) -> mark# X1)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# isNatKind X -> active# isNatKind X)
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# isNat s V1 -> mark# U21(isNatKind V1, V1), mark# U12(X1, X2, X3) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# plus(X1, X2) -> mark# X2)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# plus(X1, X2) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# s X -> s# mark X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# s X -> active# s mark X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# s X -> mark# X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U64(X1, X2, X3) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U63(X1, X2, X3) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U61(X1, X2, X3) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U62(X1, X2, X3) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U51(X1, X2) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U52(X1, X2) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U41 X -> U41# mark X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U41 X -> active# U41 mark X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U41 X -> mark# X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U31(X1, X2) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U32 X -> U32# mark X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U32 X -> active# U32 mark X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U32 X -> mark# X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U23 X -> U23# mark X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U23 X -> active# U23 mark X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U23 X -> mark# X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U21(X1, X2) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U22(X1, X2) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U16 X -> U16# mark X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U16 X -> active# U16 mark X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U16 X -> mark# X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# isNat X -> active# isNat X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U15(X1, X2) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U14(X1, X2, X3) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U13(X1, X2, X3) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U11(X1, X2, X3) -> mark# X1)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# isNatKind X -> active# isNatKind X)
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U51(tt(), N) -> mark# U52(isNatKind N, N), mark# U12(X1, X2, X3) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# plus(X1, X2) -> mark# X2)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# plus(X1, X2) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# s X -> s# mark X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# s X -> active# s mark X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# s X -> mark# X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U64(X1, X2, X3) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U63(X1, X2, X3) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U61(X1, X2, X3) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U62(X1, X2, X3) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U51(X1, X2) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U52(X1, X2) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U41 X -> U41# mark X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U41 X -> active# U41 mark X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U41 X -> mark# X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U31(X1, X2) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U32 X -> U32# mark X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U32 X -> active# U32 mark X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U32 X -> mark# X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U23 X -> U23# mark X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U23 X -> active# U23 mark X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U23 X -> mark# X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U21(X1, X2) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U22(X1, X2) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U16 X -> U16# mark X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U16 X -> active# U16 mark X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U16 X -> mark# X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# isNat X -> active# isNat X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U15(X1, X2) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U14(X1, X2, X3) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U13(X1, X2, X3) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U11(X1, X2, X3) -> mark# X1)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# isNatKind X -> active# isNatKind X)
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# plus(N, 0()) -> mark# U51(isNat N, N), mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3), U12#(active X1, X2, X3) -> U12#(X1, X2, X3))
     (mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3), U12#(mark X1, X2, X3) -> U12#(X1, X2, X3))
     (mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3), U13#(active X1, X2, X3) -> U13#(X1, X2, X3))
     (mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3), U13#(mark X1, X2, X3) -> U13#(X1, X2, X3))
     (mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3), U62#(active X1, X2, X3) -> U62#(X1, X2, X3))
     (mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3), U62#(mark X1, X2, X3) -> U62#(X1, X2, X3))
     (mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3), U63#(active X1, X2, X3) -> U63#(X1, X2, X3))
     (mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3), U63#(mark X1, X2, X3) -> U63#(X1, X2, X3))
     (U12#(X1, X2, mark X3) -> U12#(X1, X2, X3), U12#(active X1, X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, X2, mark X3) -> U12#(X1, X2, X3), U12#(mark X1, X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, X2, mark X3) -> U12#(X1, X2, X3), U12#(X1, active X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, X2, mark X3) -> U12#(X1, X2, X3), U12#(X1, mark X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, X2, mark X3) -> U12#(X1, X2, X3), U12#(X1, X2, active X3) -> U12#(X1, X2, X3))
     (U12#(X1, X2, mark X3) -> U12#(X1, X2, X3), U12#(X1, X2, mark X3) -> U12#(X1, X2, X3))
     (U12#(X1, mark X2, X3) -> U12#(X1, X2, X3), U12#(active X1, X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, mark X2, X3) -> U12#(X1, X2, X3), U12#(mark X1, X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, mark X2, X3) -> U12#(X1, X2, X3), U12#(X1, active X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, mark X2, X3) -> U12#(X1, X2, X3), U12#(X1, mark X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, mark X2, X3) -> U12#(X1, X2, X3), U12#(X1, X2, active X3) -> U12#(X1, X2, X3))
     (U12#(X1, mark X2, X3) -> U12#(X1, X2, X3), U12#(X1, X2, mark X3) -> U12#(X1, X2, X3))
     (U12#(mark X1, X2, X3) -> U12#(X1, X2, X3), U12#(active X1, X2, X3) -> U12#(X1, X2, X3))
     (U12#(mark X1, X2, X3) -> U12#(X1, X2, X3), U12#(mark X1, X2, X3) -> U12#(X1, X2, X3))
     (U12#(mark X1, X2, X3) -> U12#(X1, X2, X3), U12#(X1, active X2, X3) -> U12#(X1, X2, X3))
     (U12#(mark X1, X2, X3) -> U12#(X1, X2, X3), U12#(X1, mark X2, X3) -> U12#(X1, X2, X3))
     (U12#(mark X1, X2, X3) -> U12#(X1, X2, X3), U12#(X1, X2, active X3) -> U12#(X1, X2, X3))
     (U12#(mark X1, X2, X3) -> U12#(X1, X2, X3), U12#(X1, X2, mark X3) -> U12#(X1, X2, X3))
     (U11#(X1, X2, mark X3) -> U11#(X1, X2, X3), U11#(active X1, X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, X2, mark X3) -> U11#(X1, X2, X3), U11#(mark X1, X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, X2, mark X3) -> U11#(X1, X2, X3), U11#(X1, active X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, X2, mark X3) -> U11#(X1, X2, X3), U11#(X1, mark X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, X2, mark X3) -> U11#(X1, X2, X3), U11#(X1, X2, active X3) -> U11#(X1, X2, X3))
     (U11#(X1, X2, mark X3) -> U11#(X1, X2, X3), U11#(X1, X2, mark X3) -> U11#(X1, X2, X3))
     (U11#(X1, mark X2, X3) -> U11#(X1, X2, X3), U11#(active X1, X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, mark X2, X3) -> U11#(X1, X2, X3), U11#(mark X1, X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, mark X2, X3) -> U11#(X1, X2, X3), U11#(X1, active X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, mark X2, X3) -> U11#(X1, X2, X3), U11#(X1, mark X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, mark X2, X3) -> U11#(X1, X2, X3), U11#(X1, X2, active X3) -> U11#(X1, X2, X3))
     (U11#(X1, mark X2, X3) -> U11#(X1, X2, X3), U11#(X1, X2, mark X3) -> U11#(X1, X2, X3))
     (U11#(mark X1, X2, X3) -> U11#(X1, X2, X3), U11#(active X1, X2, X3) -> U11#(X1, X2, X3))
     (U11#(mark X1, X2, X3) -> U11#(X1, X2, X3), U11#(mark X1, X2, X3) -> U11#(X1, X2, X3))
     (U11#(mark X1, X2, X3) -> U11#(X1, X2, X3), U11#(X1, active X2, X3) -> U11#(X1, X2, X3))
     (U11#(mark X1, X2, X3) -> U11#(X1, X2, X3), U11#(X1, mark X2, X3) -> U11#(X1, X2, X3))
     (U11#(mark X1, X2, X3) -> U11#(X1, X2, X3), U11#(X1, X2, active X3) -> U11#(X1, X2, X3))
     (U11#(mark X1, X2, X3) -> U11#(X1, X2, X3), U11#(X1, X2, mark X3) -> U11#(X1, X2, X3))
     (U13#(X1, X2, mark X3) -> U13#(X1, X2, X3), U13#(active X1, X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, X2, mark X3) -> U13#(X1, X2, X3), U13#(mark X1, X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, X2, mark X3) -> U13#(X1, X2, X3), U13#(X1, active X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, X2, mark X3) -> U13#(X1, X2, X3), U13#(X1, mark X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, X2, mark X3) -> U13#(X1, X2, X3), U13#(X1, X2, active X3) -> U13#(X1, X2, X3))
     (U13#(X1, X2, mark X3) -> U13#(X1, X2, X3), U13#(X1, X2, mark X3) -> U13#(X1, X2, X3))
     (U13#(X1, mark X2, X3) -> U13#(X1, X2, X3), U13#(active X1, X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, mark X2, X3) -> U13#(X1, X2, X3), U13#(mark X1, X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, mark X2, X3) -> U13#(X1, X2, X3), U13#(X1, active X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, mark X2, X3) -> U13#(X1, X2, X3), U13#(X1, mark X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, mark X2, X3) -> U13#(X1, X2, X3), U13#(X1, X2, active X3) -> U13#(X1, X2, X3))
     (U13#(X1, mark X2, X3) -> U13#(X1, X2, X3), U13#(X1, X2, mark X3) -> U13#(X1, X2, X3))
     (U13#(mark X1, X2, X3) -> U13#(X1, X2, X3), U13#(active X1, X2, X3) -> U13#(X1, X2, X3))
     (U13#(mark X1, X2, X3) -> U13#(X1, X2, X3), U13#(mark X1, X2, X3) -> U13#(X1, X2, X3))
     (U13#(mark X1, X2, X3) -> U13#(X1, X2, X3), U13#(X1, active X2, X3) -> U13#(X1, X2, X3))
     (U13#(mark X1, X2, X3) -> U13#(X1, X2, X3), U13#(X1, mark X2, X3) -> U13#(X1, X2, X3))
     (U13#(mark X1, X2, X3) -> U13#(X1, X2, X3), U13#(X1, X2, active X3) -> U13#(X1, X2, X3))
     (U13#(mark X1, X2, X3) -> U13#(X1, X2, X3), U13#(X1, X2, mark X3) -> U13#(X1, X2, X3))
     (U14#(X1, X2, mark X3) -> U14#(X1, X2, X3), U14#(active X1, X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, X2, mark X3) -> U14#(X1, X2, X3), U14#(mark X1, X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, X2, mark X3) -> U14#(X1, X2, X3), U14#(X1, active X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, X2, mark X3) -> U14#(X1, X2, X3), U14#(X1, mark X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, X2, mark X3) -> U14#(X1, X2, X3), U14#(X1, X2, active X3) -> U14#(X1, X2, X3))
     (U14#(X1, X2, mark X3) -> U14#(X1, X2, X3), U14#(X1, X2, mark X3) -> U14#(X1, X2, X3))
     (U14#(X1, mark X2, X3) -> U14#(X1, X2, X3), U14#(active X1, X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, mark X2, X3) -> U14#(X1, X2, X3), U14#(mark X1, X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, mark X2, X3) -> U14#(X1, X2, X3), U14#(X1, active X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, mark X2, X3) -> U14#(X1, X2, X3), U14#(X1, mark X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, mark X2, X3) -> U14#(X1, X2, X3), U14#(X1, X2, active X3) -> U14#(X1, X2, X3))
     (U14#(X1, mark X2, X3) -> U14#(X1, X2, X3), U14#(X1, X2, mark X3) -> U14#(X1, X2, X3))
     (U14#(mark X1, X2, X3) -> U14#(X1, X2, X3), U14#(active X1, X2, X3) -> U14#(X1, X2, X3))
     (U14#(mark X1, X2, X3) -> U14#(X1, X2, X3), U14#(mark X1, X2, X3) -> U14#(X1, X2, X3))
     (U14#(mark X1, X2, X3) -> U14#(X1, X2, X3), U14#(X1, active X2, X3) -> U14#(X1, X2, X3))
     (U14#(mark X1, X2, X3) -> U14#(X1, X2, X3), U14#(X1, mark X2, X3) -> U14#(X1, X2, X3))
     (U14#(mark X1, X2, X3) -> U14#(X1, X2, X3), U14#(X1, X2, active X3) -> U14#(X1, X2, X3))
     (U14#(mark X1, X2, X3) -> U14#(X1, X2, X3), U14#(X1, X2, mark X3) -> U14#(X1, X2, X3))
     (U62#(X1, X2, mark X3) -> U62#(X1, X2, X3), U62#(active X1, X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, X2, mark X3) -> U62#(X1, X2, X3), U62#(mark X1, X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, X2, mark X3) -> U62#(X1, X2, X3), U62#(X1, active X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, X2, mark X3) -> U62#(X1, X2, X3), U62#(X1, mark X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, X2, mark X3) -> U62#(X1, X2, X3), U62#(X1, X2, active X3) -> U62#(X1, X2, X3))
     (U62#(X1, X2, mark X3) -> U62#(X1, X2, X3), U62#(X1, X2, mark X3) -> U62#(X1, X2, X3))
     (U62#(X1, mark X2, X3) -> U62#(X1, X2, X3), U62#(active X1, X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, mark X2, X3) -> U62#(X1, X2, X3), U62#(mark X1, X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, mark X2, X3) -> U62#(X1, X2, X3), U62#(X1, active X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, mark X2, X3) -> U62#(X1, X2, X3), U62#(X1, mark X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, mark X2, X3) -> U62#(X1, X2, X3), U62#(X1, X2, active X3) -> U62#(X1, X2, X3))
     (U62#(X1, mark X2, X3) -> U62#(X1, X2, X3), U62#(X1, X2, mark X3) -> U62#(X1, X2, X3))
     (U62#(mark X1, X2, X3) -> U62#(X1, X2, X3), U62#(active X1, X2, X3) -> U62#(X1, X2, X3))
     (U62#(mark X1, X2, X3) -> U62#(X1, X2, X3), U62#(mark X1, X2, X3) -> U62#(X1, X2, X3))
     (U62#(mark X1, X2, X3) -> U62#(X1, X2, X3), U62#(X1, active X2, X3) -> U62#(X1, X2, X3))
     (U62#(mark X1, X2, X3) -> U62#(X1, X2, X3), U62#(X1, mark X2, X3) -> U62#(X1, X2, X3))
     (U62#(mark X1, X2, X3) -> U62#(X1, X2, X3), U62#(X1, X2, active X3) -> U62#(X1, X2, X3))
     (U62#(mark X1, X2, X3) -> U62#(X1, X2, X3), U62#(X1, X2, mark X3) -> U62#(X1, X2, X3))
     (U61#(X1, X2, mark X3) -> U61#(X1, X2, X3), U61#(active X1, X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, X2, mark X3) -> U61#(X1, X2, X3), U61#(mark X1, X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, X2, mark X3) -> U61#(X1, X2, X3), U61#(X1, active X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, X2, mark X3) -> U61#(X1, X2, X3), U61#(X1, mark X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, X2, mark X3) -> U61#(X1, X2, X3), U61#(X1, X2, active X3) -> U61#(X1, X2, X3))
     (U61#(X1, X2, mark X3) -> U61#(X1, X2, X3), U61#(X1, X2, mark X3) -> U61#(X1, X2, X3))
     (U61#(X1, mark X2, X3) -> U61#(X1, X2, X3), U61#(active X1, X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, mark X2, X3) -> U61#(X1, X2, X3), U61#(mark X1, X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, mark X2, X3) -> U61#(X1, X2, X3), U61#(X1, active X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, mark X2, X3) -> U61#(X1, X2, X3), U61#(X1, mark X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, mark X2, X3) -> U61#(X1, X2, X3), U61#(X1, X2, active X3) -> U61#(X1, X2, X3))
     (U61#(X1, mark X2, X3) -> U61#(X1, X2, X3), U61#(X1, X2, mark X3) -> U61#(X1, X2, X3))
     (U61#(mark X1, X2, X3) -> U61#(X1, X2, X3), U61#(active X1, X2, X3) -> U61#(X1, X2, X3))
     (U61#(mark X1, X2, X3) -> U61#(X1, X2, X3), U61#(mark X1, X2, X3) -> U61#(X1, X2, X3))
     (U61#(mark X1, X2, X3) -> U61#(X1, X2, X3), U61#(X1, active X2, X3) -> U61#(X1, X2, X3))
     (U61#(mark X1, X2, X3) -> U61#(X1, X2, X3), U61#(X1, mark X2, X3) -> U61#(X1, X2, X3))
     (U61#(mark X1, X2, X3) -> U61#(X1, X2, X3), U61#(X1, X2, active X3) -> U61#(X1, X2, X3))
     (U61#(mark X1, X2, X3) -> U61#(X1, X2, X3), U61#(X1, X2, mark X3) -> U61#(X1, X2, X3))
     (U63#(X1, X2, mark X3) -> U63#(X1, X2, X3), U63#(active X1, X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, X2, mark X3) -> U63#(X1, X2, X3), U63#(mark X1, X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, X2, mark X3) -> U63#(X1, X2, X3), U63#(X1, active X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, X2, mark X3) -> U63#(X1, X2, X3), U63#(X1, mark X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, X2, mark X3) -> U63#(X1, X2, X3), U63#(X1, X2, active X3) -> U63#(X1, X2, X3))
     (U63#(X1, X2, mark X3) -> U63#(X1, X2, X3), U63#(X1, X2, mark X3) -> U63#(X1, X2, X3))
     (U63#(X1, mark X2, X3) -> U63#(X1, X2, X3), U63#(active X1, X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, mark X2, X3) -> U63#(X1, X2, X3), U63#(mark X1, X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, mark X2, X3) -> U63#(X1, X2, X3), U63#(X1, active X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, mark X2, X3) -> U63#(X1, X2, X3), U63#(X1, mark X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, mark X2, X3) -> U63#(X1, X2, X3), U63#(X1, X2, active X3) -> U63#(X1, X2, X3))
     (U63#(X1, mark X2, X3) -> U63#(X1, X2, X3), U63#(X1, X2, mark X3) -> U63#(X1, X2, X3))
     (U63#(mark X1, X2, X3) -> U63#(X1, X2, X3), U63#(active X1, X2, X3) -> U63#(X1, X2, X3))
     (U63#(mark X1, X2, X3) -> U63#(X1, X2, X3), U63#(mark X1, X2, X3) -> U63#(X1, X2, X3))
     (U63#(mark X1, X2, X3) -> U63#(X1, X2, X3), U63#(X1, active X2, X3) -> U63#(X1, X2, X3))
     (U63#(mark X1, X2, X3) -> U63#(X1, X2, X3), U63#(X1, mark X2, X3) -> U63#(X1, X2, X3))
     (U63#(mark X1, X2, X3) -> U63#(X1, X2, X3), U63#(X1, X2, active X3) -> U63#(X1, X2, X3))
     (U63#(mark X1, X2, X3) -> U63#(X1, X2, X3), U63#(X1, X2, mark X3) -> U63#(X1, X2, X3))
     (U64#(X1, X2, mark X3) -> U64#(X1, X2, X3), U64#(active X1, X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, X2, mark X3) -> U64#(X1, X2, X3), U64#(mark X1, X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, X2, mark X3) -> U64#(X1, X2, X3), U64#(X1, active X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, X2, mark X3) -> U64#(X1, X2, X3), U64#(X1, mark X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, X2, mark X3) -> U64#(X1, X2, X3), U64#(X1, X2, active X3) -> U64#(X1, X2, X3))
     (U64#(X1, X2, mark X3) -> U64#(X1, X2, X3), U64#(X1, X2, mark X3) -> U64#(X1, X2, X3))
     (U64#(X1, mark X2, X3) -> U64#(X1, X2, X3), U64#(active X1, X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, mark X2, X3) -> U64#(X1, X2, X3), U64#(mark X1, X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, mark X2, X3) -> U64#(X1, X2, X3), U64#(X1, active X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, mark X2, X3) -> U64#(X1, X2, X3), U64#(X1, mark X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, mark X2, X3) -> U64#(X1, X2, X3), U64#(X1, X2, active X3) -> U64#(X1, X2, X3))
     (U64#(X1, mark X2, X3) -> U64#(X1, X2, X3), U64#(X1, X2, mark X3) -> U64#(X1, X2, X3))
     (U64#(mark X1, X2, X3) -> U64#(X1, X2, X3), U64#(active X1, X2, X3) -> U64#(X1, X2, X3))
     (U64#(mark X1, X2, X3) -> U64#(X1, X2, X3), U64#(mark X1, X2, X3) -> U64#(X1, X2, X3))
     (U64#(mark X1, X2, X3) -> U64#(X1, X2, X3), U64#(X1, active X2, X3) -> U64#(X1, X2, X3))
     (U64#(mark X1, X2, X3) -> U64#(X1, X2, X3), U64#(X1, mark X2, X3) -> U64#(X1, X2, X3))
     (U64#(mark X1, X2, X3) -> U64#(X1, X2, X3), U64#(X1, X2, active X3) -> U64#(X1, X2, X3))
     (U64#(mark X1, X2, X3) -> U64#(X1, X2, X3), U64#(X1, X2, mark X3) -> U64#(X1, X2, X3))
     (active# U61(tt(), M, N) -> U62#(isNatKind M, M, N), U62#(active X1, X2, X3) -> U62#(X1, X2, X3))
     (active# U61(tt(), M, N) -> U62#(isNatKind M, M, N), U62#(mark X1, X2, X3) -> U62#(X1, X2, X3))
     (active# plus(N, s M) -> U61#(isNat M, M, N), U61#(active X1, X2, X3) -> U61#(X1, X2, X3))
     (active# plus(N, s M) -> U61#(isNat M, M, N), U61#(mark X1, X2, X3) -> U61#(X1, X2, X3))
     (mark# U16 X -> active# U16 mark X, active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U16 X -> active# U16 mark X, active# plus(N, 0()) -> isNat# N)
     (mark# U16 X -> active# U16 mark X, active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U16 X -> active# U16 mark X, active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U16 X -> active# U16 mark X, active# plus(N, s M) -> isNat# M)
     (mark# U16 X -> active# U16 mark X, active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U16 X -> active# U16 mark X, active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U16 X -> active# U16 mark X, active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U16 X -> active# U16 mark X, active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U16 X -> active# U16 mark X, active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U16 X -> active# U16 mark X, active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U16 X -> active# U16 mark X, active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U16 X -> active# U16 mark X, active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U16 X -> active# U16 mark X, active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U16 X -> active# U16 mark X, active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U16 X -> active# U16 mark X, active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U16 X -> active# U16 mark X, active# U62(tt(), M, N) -> isNat# N)
     (mark# U16 X -> active# U16 mark X, active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U16 X -> active# U16 mark X, active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U16 X -> active# U16 mark X, active# U51(tt(), N) -> isNatKind# N)
     (mark# U16 X -> active# U16 mark X, active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U16 X -> active# U16 mark X, active# U52(tt(), N) -> mark# N)
     (mark# U16 X -> active# U16 mark X, active# U41 tt() -> mark# tt())
     (mark# U16 X -> active# U16 mark X, active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U16 X -> active# U16 mark X, active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U16 X -> active# U16 mark X, active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U16 X -> active# U16 mark X, active# U32 tt() -> mark# tt())
     (mark# U16 X -> active# U16 mark X, active# U23 tt() -> mark# tt())
     (mark# U16 X -> active# U16 mark X, active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U16 X -> active# U16 mark X, active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U16 X -> active# U16 mark X, active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U16 X -> active# U16 mark X, active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U16 X -> active# U16 mark X, active# U22(tt(), V1) -> isNat# V1)
     (mark# U16 X -> active# U16 mark X, active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U16 X -> active# U16 mark X, active# U16 tt() -> mark# tt())
     (mark# U16 X -> active# U16 mark X, active# isNat 0() -> mark# tt())
     (mark# U16 X -> active# U16 mark X, active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U16 X -> active# U16 mark X, active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U16 X -> active# U16 mark X, active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U16 X -> active# U16 mark X, active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U16 X -> active# U16 mark X, active# isNat s V1 -> isNatKind# V1)
     (mark# U16 X -> active# U16 mark X, active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U16 X -> active# U16 mark X, active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U16 X -> active# U16 mark X, active# U15(tt(), V2) -> isNat# V2)
     (mark# U16 X -> active# U16 mark X, active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U16 X -> active# U16 mark X, active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U16 X -> active# U16 mark X, active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U16 X -> active# U16 mark X, active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U16 X -> active# U16 mark X, active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U16 X -> active# U16 mark X, active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U16 X -> active# U16 mark X, active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U16 X -> active# U16 mark X, active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U16 X -> active# U16 mark X, active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U16 X -> active# U16 mark X, active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U16 X -> active# U16 mark X, active# isNatKind 0() -> mark# tt())
     (mark# U16 X -> active# U16 mark X, active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U16 X -> active# U16 mark X, active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U16 X -> active# U16 mark X, active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U16 X -> active# U16 mark X, active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U16 X -> active# U16 mark X, active# isNatKind s V1 -> isNatKind# V1)
     (mark# U16 X -> active# U16 mark X, active# isNatKind s V1 -> mark# U41 isNatKind V1)
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     (mark# U16 X -> active# U16 mark X, active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U16 X -> active# U16 mark X, active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
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     (mark# U23 X -> active# U23 mark X, active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U23 X -> active# U23 mark X, active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U23 X -> active# U23 mark X, active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U23 X -> active# U23 mark X, active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U23 X -> active# U23 mark X, active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
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     (mark# U23 X -> active# U23 mark X, active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U23 X -> active# U23 mark X, active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
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     (mark# U23 X -> active# U23 mark X, active# U51(tt(), N) -> isNatKind# N)
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     (mark# s X -> active# s mark X, active# U61(tt(), M, N) -> isNatKind# M)
     (mark# s X -> active# s mark X, active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# s X -> active# s mark X, active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# s X -> active# s mark X, active# U62(tt(), M, N) -> isNat# N)
     (mark# s X -> active# s mark X, active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# s X -> active# s mark X, active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# s X -> active# s mark X, active# U51(tt(), N) -> isNatKind# N)
     (mark# s X -> active# s mark X, active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# s X -> active# s mark X, active# U52(tt(), N) -> mark# N)
     (mark# s X -> active# s mark X, active# U41 tt() -> mark# tt())
     (mark# s X -> active# s mark X, active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# s X -> active# s mark X, active# U31(tt(), V2) -> isNatKind# V2)
     (mark# s X -> active# s mark X, active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# s X -> active# s mark X, active# U32 tt() -> mark# tt())
     (mark# s X -> active# s mark X, active# U23 tt() -> mark# tt())
     (mark# s X -> active# s mark X, active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# s X -> active# s mark X, active# U21(tt(), V1) -> isNatKind# V1)
     (mark# s X -> active# s mark X, active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# s X -> active# s mark X, active# U22(tt(), V1) -> U23# isNat V1)
     (mark# s X -> active# s mark X, active# U22(tt(), V1) -> isNat# V1)
     (mark# s X -> active# s mark X, active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# s X -> active# s mark X, active# U16 tt() -> mark# tt())
     (mark# s X -> active# s mark X, active# isNat 0() -> mark# tt())
     (mark# s X -> active# s mark X, active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# s X -> active# s mark X, active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# s X -> active# s mark X, active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# s X -> active# s mark X, active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# s X -> active# s mark X, active# isNat s V1 -> isNatKind# V1)
     (mark# s X -> active# s mark X, active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# s X -> active# s mark X, active# U15(tt(), V2) -> U16# isNat V2)
     (mark# s X -> active# s mark X, active# U15(tt(), V2) -> isNat# V2)
     (mark# s X -> active# s mark X, active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# s X -> active# s mark X, active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# s X -> active# s mark X, active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# s X -> active# s mark X, active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# s X -> active# s mark X, active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# s X -> active# s mark X, active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# s X -> active# s mark X, active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# s X -> active# s mark X, active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# s X -> active# s mark X, active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# s X -> active# s mark X, active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# s X -> active# s mark X, active# isNatKind 0() -> mark# tt())
     (mark# s X -> active# s mark X, active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# s X -> active# s mark X, active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# s X -> active# s mark X, active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# s X -> active# s mark X, active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# s X -> active# s mark X, active# isNatKind s V1 -> isNatKind# V1)
     (mark# s X -> active# s mark X, active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# s X -> active# s mark X, active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# s X -> active# s mark X, active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# s X -> active# s mark X, active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (isNatKind# active X -> isNatKind# X, isNatKind# active X -> isNatKind# X)
     (isNatKind# active X -> isNatKind# X, isNatKind# mark X -> isNatKind# X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# plus(X1, X2) -> mark# X2)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# plus(X1, X2) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# s X -> s# mark X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# s X -> active# s mark X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# s X -> mark# X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U64(X1, X2, X3) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U63(X1, X2, X3) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U61(X1, X2, X3) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U62(X1, X2, X3) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U51(X1, X2) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U52(X1, X2) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U41 X -> U41# mark X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U41 X -> active# U41 mark X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U41 X -> mark# X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U31(X1, X2) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U32 X -> U32# mark X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U32 X -> active# U32 mark X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U32 X -> mark# X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U23 X -> U23# mark X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U23 X -> active# U23 mark X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U23 X -> mark# X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U21(X1, X2) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U22(X1, X2) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U16 X -> U16# mark X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U16 X -> active# U16 mark X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U16 X -> mark# X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# isNat X -> active# isNat X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U15(X1, X2) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U14(X1, X2, X3) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U13(X1, X2, X3) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U11(X1, X2, X3) -> mark# X1)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# isNatKind X -> active# isNatKind X)
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U15(tt(), V2) -> mark# U16 isNat V2, mark# U12(X1, X2, X3) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# plus(X1, X2) -> mark# X2)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# plus(X1, X2) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# s X -> s# mark X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# s X -> active# s mark X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# s X -> mark# X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U64(X1, X2, X3) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U63(X1, X2, X3) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U61(X1, X2, X3) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U62(X1, X2, X3) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U51(X1, X2) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U52(X1, X2) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U41 X -> U41# mark X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U41 X -> active# U41 mark X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U41 X -> mark# X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U31(X1, X2) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U32 X -> U32# mark X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U32 X -> active# U32 mark X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U32 X -> mark# X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U23 X -> U23# mark X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U23 X -> active# U23 mark X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U23 X -> mark# X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U21(X1, X2) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U22(X1, X2) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U16 X -> U16# mark X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U16 X -> active# U16 mark X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U16 X -> mark# X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# isNat X -> active# isNat X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U15(X1, X2) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U14(X1, X2, X3) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U13(X1, X2, X3) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U11(X1, X2, X3) -> mark# X1)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# isNatKind X -> active# isNatKind X)
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U31(tt(), V2) -> mark# U32 isNatKind V2, mark# U12(X1, X2, X3) -> mark# X1)
     (isNat# mark X -> isNat# X, isNat# active X -> isNat# X)
     (isNat# mark X -> isNat# X, isNat# mark X -> isNat# X)
     (U16# mark X -> U16# X, U16# active X -> U16# X)
     (U16# mark X -> U16# X, U16# mark X -> U16# X)
     (U23# mark X -> U23# X, U23# active X -> U23# X)
     (U23# mark X -> U23# X, U23# mark X -> U23# X)
     (U32# mark X -> U32# X, U32# active X -> U32# X)
     (U32# mark X -> U32# X, U32# mark X -> U32# X)
     (U41# mark X -> U41# X, U41# active X -> U41# X)
     (U41# mark X -> U41# X, U41# mark X -> U41# X)
     (s# mark X -> s# X, s# active X -> s# X)
     (s# mark X -> s# X, s# mark X -> s# X)
     (active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2), U13#(active X1, X2, X3) -> U13#(X1, X2, X3))
     (active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2), U13#(mark X1, X2, X3) -> U13#(X1, X2, X3))
     (active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2), U14#(active X1, X2, X3) -> U14#(X1, X2, X3))
     (active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2), U14#(mark X1, X2, X3) -> U14#(X1, X2, X3))
     (mark# plus(X1, X2) -> plus#(mark X1, mark X2), plus#(active X1, X2) -> plus#(X1, X2))
     (mark# plus(X1, X2) -> plus#(mark X1, mark X2), plus#(mark X1, X2) -> plus#(X1, X2))
     (mark# plus(X1, X2) -> plus#(mark X1, mark X2), plus#(X1, active X2) -> plus#(X1, X2))
     (mark# plus(X1, X2) -> plus#(mark X1, mark X2), plus#(X1, mark X2) -> plus#(X1, X2))
     (mark# U22(X1, X2) -> U22#(mark X1, X2), U22#(active X1, X2) -> U22#(X1, X2))
     (mark# U22(X1, X2) -> U22#(mark X1, X2), U22#(mark X1, X2) -> U22#(X1, X2))
     (mark# U31(X1, X2) -> U31#(mark X1, X2), U31#(active X1, X2) -> U31#(X1, X2))
     (mark# U31(X1, X2) -> U31#(mark X1, X2), U31#(mark X1, X2) -> U31#(X1, X2))
     (mark# U51(X1, X2) -> U51#(mark X1, X2), U51#(active X1, X2) -> U51#(X1, X2))
     (mark# U51(X1, X2) -> U51#(mark X1, X2), U51#(mark X1, X2) -> U51#(X1, X2))
     (mark# isNat X -> active# isNat X, active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# isNat X -> active# isNat X, active# plus(N, 0()) -> isNat# N)
     (mark# isNat X -> active# isNat X, active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# isNat X -> active# isNat X, active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# isNat X -> active# isNat X, active# plus(N, s M) -> isNat# M)
     (mark# isNat X -> active# isNat X, active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# isNat X -> active# isNat X, active# U64(tt(), M, N) -> plus#(N, M))
     (mark# isNat X -> active# isNat X, active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# isNat X -> active# isNat X, active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# isNat X -> active# isNat X, active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# isNat X -> active# isNat X, active# U63(tt(), M, N) -> isNatKind# N)
     (mark# isNat X -> active# isNat X, active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# isNat X -> active# isNat X, active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# isNat X -> active# isNat X, active# U61(tt(), M, N) -> isNatKind# M)
     (mark# isNat X -> active# isNat X, active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# isNat X -> active# isNat X, active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# isNat X -> active# isNat X, active# U62(tt(), M, N) -> isNat# N)
     (mark# isNat X -> active# isNat X, active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# isNat X -> active# isNat X, active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# isNat X -> active# isNat X, active# U51(tt(), N) -> isNatKind# N)
     (mark# isNat X -> active# isNat X, active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# isNat X -> active# isNat X, active# U52(tt(), N) -> mark# N)
     (mark# isNat X -> active# isNat X, active# U41 tt() -> mark# tt())
     (mark# isNat X -> active# isNat X, active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# isNat X -> active# isNat X, active# U31(tt(), V2) -> isNatKind# V2)
     (mark# isNat X -> active# isNat X, active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# isNat X -> active# isNat X, active# U32 tt() -> mark# tt())
     (mark# isNat X -> active# isNat X, active# U23 tt() -> mark# tt())
     (mark# isNat X -> active# isNat X, active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# isNat X -> active# isNat X, active# U21(tt(), V1) -> isNatKind# V1)
     (mark# isNat X -> active# isNat X, active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# isNat X -> active# isNat X, active# U22(tt(), V1) -> U23# isNat V1)
     (mark# isNat X -> active# isNat X, active# U22(tt(), V1) -> isNat# V1)
     (mark# isNat X -> active# isNat X, active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# isNat X -> active# isNat X, active# U16 tt() -> mark# tt())
     (mark# isNat X -> active# isNat X, active# isNat 0() -> mark# tt())
     (mark# isNat X -> active# isNat X, active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# isNat X -> active# isNat X, active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# isNat X -> active# isNat X, active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# isNat X -> active# isNat X, active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# isNat X -> active# isNat X, active# isNat s V1 -> isNatKind# V1)
     (mark# isNat X -> active# isNat X, active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# isNat X -> active# isNat X, active# U15(tt(), V2) -> U16# isNat V2)
     (mark# isNat X -> active# isNat X, active# U15(tt(), V2) -> isNat# V2)
     (mark# isNat X -> active# isNat X, active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# isNat X -> active# isNat X, active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# isNat X -> active# isNat X, active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# isNat X -> active# isNat X, active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# isNat X -> active# isNat X, active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# isNat X -> active# isNat X, active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# isNat X -> active# isNat X, active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# isNat X -> active# isNat X, active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# isNat X -> active# isNat X, active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# isNat X -> active# isNat X, active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# isNat X -> active# isNat X, active# isNatKind 0() -> mark# tt())
     (mark# isNat X -> active# isNat X, active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# isNat X -> active# isNat X, active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# isNat X -> active# isNat X, active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# isNat X -> active# isNat X, active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# isNat X -> active# isNat X, active# isNatKind s V1 -> isNatKind# V1)
     (mark# isNat X -> active# isNat X, active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# isNat X -> active# isNat X, active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# isNat X -> active# isNat X, active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# isNat X -> active# isNat X, active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U23 X -> U23# mark X, U23# active X -> U23# X)
     (mark# U23 X -> U23# mark X, U23# mark X -> U23# X)
     (mark# U41 X -> U41# mark X, U41# active X -> U41# X)
     (mark# U41 X -> U41# mark X, U41# mark X -> U41# X)
     (active# U15(tt(), V2) -> U16# isNat V2, U16# active X -> U16# X)
     (active# U15(tt(), V2) -> U16# isNat V2, U16# mark X -> U16# X)
     (active# isNatKind s V1 -> U41# isNatKind V1, U41# active X -> U41# X)
     (active# isNatKind s V1 -> U41# isNatKind V1, U41# mark X -> U41# X)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# plus(N, 0()) -> isNat# N)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# plus(N, s M) -> isNat# M)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U62(tt(), M, N) -> isNat# N)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U51(tt(), N) -> isNatKind# N)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U52(tt(), N) -> mark# N)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U41 tt() -> mark# tt())
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U32 tt() -> mark# tt())
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U23 tt() -> mark# tt())
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U22(tt(), V1) -> isNat# V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U16 tt() -> mark# tt())
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNat 0() -> mark# tt())
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNat s V1 -> isNatKind# V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U15(tt(), V2) -> isNat# V2)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNatKind 0() -> mark# tt())
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNatKind s V1 -> isNatKind# V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# plus(X1, X2) -> active# plus(mark X1, mark X2), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (U15#(X1, active X2) -> U15#(X1, X2), U15#(active X1, X2) -> U15#(X1, X2))
     (U15#(X1, active X2) -> U15#(X1, X2), U15#(mark X1, X2) -> U15#(X1, X2))
     (U15#(X1, active X2) -> U15#(X1, X2), U15#(X1, active X2) -> U15#(X1, X2))
     (U15#(X1, active X2) -> U15#(X1, X2), U15#(X1, mark X2) -> U15#(X1, X2))
     (U15#(active X1, X2) -> U15#(X1, X2), U15#(active X1, X2) -> U15#(X1, X2))
     (U15#(active X1, X2) -> U15#(X1, X2), U15#(mark X1, X2) -> U15#(X1, X2))
     (U15#(active X1, X2) -> U15#(X1, X2), U15#(X1, active X2) -> U15#(X1, X2))
     (U15#(active X1, X2) -> U15#(X1, X2), U15#(X1, mark X2) -> U15#(X1, X2))
     (U22#(X1, active X2) -> U22#(X1, X2), U22#(active X1, X2) -> U22#(X1, X2))
     (U22#(X1, active X2) -> U22#(X1, X2), U22#(mark X1, X2) -> U22#(X1, X2))
     (U22#(X1, active X2) -> U22#(X1, X2), U22#(X1, active X2) -> U22#(X1, X2))
     (U22#(X1, active X2) -> U22#(X1, X2), U22#(X1, mark X2) -> U22#(X1, X2))
     (U22#(active X1, X2) -> U22#(X1, X2), U22#(active X1, X2) -> U22#(X1, X2))
     (U22#(active X1, X2) -> U22#(X1, X2), U22#(mark X1, X2) -> U22#(X1, X2))
     (U22#(active X1, X2) -> U22#(X1, X2), U22#(X1, active X2) -> U22#(X1, X2))
     (U22#(active X1, X2) -> U22#(X1, X2), U22#(X1, mark X2) -> U22#(X1, X2))
     (U21#(X1, active X2) -> U21#(X1, X2), U21#(active X1, X2) -> U21#(X1, X2))
     (U21#(X1, active X2) -> U21#(X1, X2), U21#(mark X1, X2) -> U21#(X1, X2))
     (U21#(X1, active X2) -> U21#(X1, X2), U21#(X1, active X2) -> U21#(X1, X2))
     (U21#(X1, active X2) -> U21#(X1, X2), U21#(X1, mark X2) -> U21#(X1, X2))
     (U21#(active X1, X2) -> U21#(X1, X2), U21#(active X1, X2) -> U21#(X1, X2))
     (U21#(active X1, X2) -> U21#(X1, X2), U21#(mark X1, X2) -> U21#(X1, X2))
     (U21#(active X1, X2) -> U21#(X1, X2), U21#(X1, active X2) -> U21#(X1, X2))
     (U21#(active X1, X2) -> U21#(X1, X2), U21#(X1, mark X2) -> U21#(X1, X2))
     (U31#(X1, active X2) -> U31#(X1, X2), U31#(active X1, X2) -> U31#(X1, X2))
     (U31#(X1, active X2) -> U31#(X1, X2), U31#(mark X1, X2) -> U31#(X1, X2))
     (U31#(X1, active X2) -> U31#(X1, X2), U31#(X1, active X2) -> U31#(X1, X2))
     (U31#(X1, active X2) -> U31#(X1, X2), U31#(X1, mark X2) -> U31#(X1, X2))
     (U31#(active X1, X2) -> U31#(X1, X2), U31#(active X1, X2) -> U31#(X1, X2))
     (U31#(active X1, X2) -> U31#(X1, X2), U31#(mark X1, X2) -> U31#(X1, X2))
     (U31#(active X1, X2) -> U31#(X1, X2), U31#(X1, active X2) -> U31#(X1, X2))
     (U31#(active X1, X2) -> U31#(X1, X2), U31#(X1, mark X2) -> U31#(X1, X2))
     (U52#(X1, active X2) -> U52#(X1, X2), U52#(active X1, X2) -> U52#(X1, X2))
     (U52#(X1, active X2) -> U52#(X1, X2), U52#(mark X1, X2) -> U52#(X1, X2))
     (U52#(X1, active X2) -> U52#(X1, X2), U52#(X1, active X2) -> U52#(X1, X2))
     (U52#(X1, active X2) -> U52#(X1, X2), U52#(X1, mark X2) -> U52#(X1, X2))
     (U52#(active X1, X2) -> U52#(X1, X2), U52#(active X1, X2) -> U52#(X1, X2))
     (U52#(active X1, X2) -> U52#(X1, X2), U52#(mark X1, X2) -> U52#(X1, X2))
     (U52#(active X1, X2) -> U52#(X1, X2), U52#(X1, active X2) -> U52#(X1, X2))
     (U52#(active X1, X2) -> U52#(X1, X2), U52#(X1, mark X2) -> U52#(X1, X2))
     (U51#(X1, active X2) -> U51#(X1, X2), U51#(active X1, X2) -> U51#(X1, X2))
     (U51#(X1, active X2) -> U51#(X1, X2), U51#(mark X1, X2) -> U51#(X1, X2))
     (U51#(X1, active X2) -> U51#(X1, X2), U51#(X1, active X2) -> U51#(X1, X2))
     (U51#(X1, active X2) -> U51#(X1, X2), U51#(X1, mark X2) -> U51#(X1, X2))
     (U51#(active X1, X2) -> U51#(X1, X2), U51#(active X1, X2) -> U51#(X1, X2))
     (U51#(active X1, X2) -> U51#(X1, X2), U51#(mark X1, X2) -> U51#(X1, X2))
     (U51#(active X1, X2) -> U51#(X1, X2), U51#(X1, active X2) -> U51#(X1, X2))
     (U51#(active X1, X2) -> U51#(X1, X2), U51#(X1, mark X2) -> U51#(X1, X2))
     (plus#(X1, active X2) -> plus#(X1, X2), plus#(active X1, X2) -> plus#(X1, X2))
     (plus#(X1, active X2) -> plus#(X1, X2), plus#(mark X1, X2) -> plus#(X1, X2))
     (plus#(X1, active X2) -> plus#(X1, X2), plus#(X1, active X2) -> plus#(X1, X2))
     (plus#(X1, active X2) -> plus#(X1, X2), plus#(X1, mark X2) -> plus#(X1, X2))
     (plus#(active X1, X2) -> plus#(X1, X2), plus#(active X1, X2) -> plus#(X1, X2))
     (plus#(active X1, X2) -> plus#(X1, X2), plus#(mark X1, X2) -> plus#(X1, X2))
     (plus#(active X1, X2) -> plus#(X1, X2), plus#(X1, active X2) -> plus#(X1, X2))
     (plus#(active X1, X2) -> plus#(X1, X2), plus#(X1, mark X2) -> plus#(X1, X2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# plus(N, 0()) -> isNat# N)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# plus(N, s M) -> isNat# M)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U62(tt(), M, N) -> isNat# N)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U51(tt(), N) -> isNatKind# N)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U52(tt(), N) -> mark# N)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U41 tt() -> mark# tt())
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U32 tt() -> mark# tt())
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U23 tt() -> mark# tt())
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U22(tt(), V1) -> isNat# V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U16 tt() -> mark# tt())
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNat 0() -> mark# tt())
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNat s V1 -> isNatKind# V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U15(tt(), V2) -> isNat# V2)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNatKind 0() -> mark# tt())
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# plus(N, 0()) -> isNat# N)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# plus(N, s M) -> isNat# M)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U62(tt(), M, N) -> isNat# N)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U51(tt(), N) -> isNatKind# N)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U52(tt(), N) -> mark# N)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U41 tt() -> mark# tt())
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U32 tt() -> mark# tt())
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U23 tt() -> mark# tt())
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U22(tt(), V1) -> isNat# V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U16 tt() -> mark# tt())
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNat 0() -> mark# tt())
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNat s V1 -> isNatKind# V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U15(tt(), V2) -> isNat# V2)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNatKind 0() -> mark# tt())
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# plus(N, 0()) -> isNat# N)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# plus(N, s M) -> isNat# M)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U62(tt(), M, N) -> isNat# N)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U51(tt(), N) -> isNatKind# N)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U52(tt(), N) -> mark# N)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U41 tt() -> mark# tt())
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U32 tt() -> mark# tt())
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U23 tt() -> mark# tt())
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U22(tt(), V1) -> isNat# V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U16 tt() -> mark# tt())
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNat 0() -> mark# tt())
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNat s V1 -> isNatKind# V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U15(tt(), V2) -> isNat# V2)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNatKind 0() -> mark# tt())
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# plus(N, 0()) -> isNat# N)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# plus(N, s M) -> isNat# M)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U62(tt(), M, N) -> isNat# N)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U51(tt(), N) -> isNatKind# N)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U52(tt(), N) -> mark# N)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U41 tt() -> mark# tt())
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U32 tt() -> mark# tt())
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U23 tt() -> mark# tt())
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U22(tt(), V1) -> isNat# V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U16 tt() -> mark# tt())
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNat 0() -> mark# tt())
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNat s V1 -> isNatKind# V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U15(tt(), V2) -> isNat# V2)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNatKind 0() -> mark# tt())
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# plus(X1, X2) -> mark# X2)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# plus(X1, X2) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# s X -> s# mark X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# s X -> active# s mark X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# s X -> mark# X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U64(X1, X2, X3) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U63(X1, X2, X3) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U61(X1, X2, X3) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U62(X1, X2, X3) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U51(X1, X2) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U52(X1, X2) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U41 X -> U41# mark X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U41 X -> active# U41 mark X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U41 X -> mark# X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U31(X1, X2) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U32 X -> U32# mark X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U32 X -> active# U32 mark X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U32 X -> mark# X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U23 X -> U23# mark X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U23 X -> active# U23 mark X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U23 X -> mark# X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U21(X1, X2) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U22(X1, X2) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U16 X -> U16# mark X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U16 X -> active# U16 mark X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U16 X -> mark# X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# isNat X -> active# isNat X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U15(X1, X2) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U14(X1, X2, X3) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U13(X1, X2, X3) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U11(X1, X2, X3) -> mark# X1)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# isNatKind X -> active# isNatKind X)
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2), mark# U12(X1, X2, X3) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# plus(X1, X2) -> mark# X2)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# plus(X1, X2) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# s X -> s# mark X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# s X -> active# s mark X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# s X -> mark# X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U64(X1, X2, X3) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U63(X1, X2, X3) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U61(X1, X2, X3) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U62(X1, X2, X3) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U51(X1, X2) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U52(X1, X2) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U41 X -> U41# mark X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U41 X -> active# U41 mark X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U41 X -> mark# X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U31(X1, X2) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U32 X -> U32# mark X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U32 X -> active# U32 mark X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U32 X -> mark# X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U23 X -> U23# mark X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U23 X -> active# U23 mark X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U23 X -> mark# X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U21(X1, X2) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U22(X1, X2) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U16 X -> U16# mark X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U16 X -> active# U16 mark X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U16 X -> mark# X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# isNat X -> active# isNat X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U15(X1, X2) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U14(X1, X2, X3) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U13(X1, X2, X3) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U11(X1, X2, X3) -> mark# X1)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# isNatKind X -> active# isNatKind X)
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2), mark# U12(X1, X2, X3) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# plus(X1, X2) -> mark# X2)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# plus(X1, X2) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# s X -> s# mark X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# s X -> active# s mark X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# s X -> mark# X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U64(X1, X2, X3) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U63(X1, X2, X3) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U61(X1, X2, X3) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U62(X1, X2, X3) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U51(X1, X2) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U52(X1, X2) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U41 X -> U41# mark X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U41 X -> active# U41 mark X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U41 X -> mark# X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U31(X1, X2) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U32 X -> U32# mark X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U32 X -> active# U32 mark X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U32 X -> mark# X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U23 X -> U23# mark X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U23 X -> active# U23 mark X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U23 X -> mark# X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U21(X1, X2) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U22(X1, X2) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U16 X -> U16# mark X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U16 X -> active# U16 mark X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U16 X -> mark# X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# isNat X -> active# isNat X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U15(X1, X2) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U14(X1, X2, X3) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U13(X1, X2, X3) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U11(X1, X2, X3) -> mark# X1)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# isNatKind X -> active# isNatKind X)
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N), mark# U12(X1, X2, X3) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# plus(X1, X2) -> mark# X2)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# plus(X1, X2) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# s X -> s# mark X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# s X -> active# s mark X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# s X -> mark# X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U64(X1, X2, X3) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U63(X1, X2, X3) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U61(X1, X2, X3) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U62(X1, X2, X3) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U51(X1, X2) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U52(X1, X2) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U41 X -> U41# mark X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U41 X -> active# U41 mark X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U41 X -> mark# X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U31(X1, X2) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U32 X -> U32# mark X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U32 X -> active# U32 mark X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U32 X -> mark# X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U23 X -> U23# mark X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U23 X -> active# U23 mark X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U23 X -> mark# X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U21(X1, X2) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U22(X1, X2) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U16 X -> U16# mark X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U16 X -> active# U16 mark X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U16 X -> mark# X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# isNat X -> active# isNat X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U15(X1, X2) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U14(X1, X2, X3) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U13(X1, X2, X3) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U11(X1, X2, X3) -> mark# X1)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# isNatKind X -> active# isNatKind X)
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# plus(N, s M) -> mark# U61(isNat M, M, N), mark# U12(X1, X2, X3) -> mark# X1)
     (active# U21(tt(), V1) -> U22#(isNatKind V1, V1), U22#(active X1, X2) -> U22#(X1, X2))
     (active# U21(tt(), V1) -> U22#(isNatKind V1, V1), U22#(mark X1, X2) -> U22#(X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# 0() -> active# 0())
     (mark# U11(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# s X -> s# mark X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# s X -> mark# X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# tt() -> active# tt())
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U11(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# 0() -> active# 0())
     (mark# U14(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# s X -> s# mark X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# s X -> mark# X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# tt() -> active# tt())
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U14(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# 0() -> active# 0())
     (mark# U22(X1, X2) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U22(X1, X2) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U22(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U22(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# s X -> s# mark X)
     (mark# U22(X1, X2) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U22(X1, X2) -> mark# X1, mark# s X -> mark# X)
     (mark# U22(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U22(X1, X2) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U22(X1, X2) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U22(X1, X2) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U22(X1, X2) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U22(X1, X2) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U22(X1, X2) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U22(X1, X2) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U22(X1, X2) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U22(X1, X2) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U22(X1, X2) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U22(X1, X2) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U22(X1, X2) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U22(X1, X2) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U22(X1, X2) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# tt() -> active# tt())
     (mark# U22(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U22(X1, X2) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U22(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U22(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# 0() -> active# 0())
     (mark# U31(X1, X2) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U31(X1, X2) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U31(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U31(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# s X -> s# mark X)
     (mark# U31(X1, X2) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U31(X1, X2) -> mark# X1, mark# s X -> mark# X)
     (mark# U31(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U31(X1, X2) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U31(X1, X2) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U31(X1, X2) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U31(X1, X2) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U31(X1, X2) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U31(X1, X2) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U31(X1, X2) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U31(X1, X2) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U31(X1, X2) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U31(X1, X2) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U31(X1, X2) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U31(X1, X2) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U31(X1, X2) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U31(X1, X2) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# tt() -> active# tt())
     (mark# U31(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U31(X1, X2) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U31(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U31(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# 0() -> active# 0())
     (mark# U51(X1, X2) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U51(X1, X2) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U51(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U51(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# s X -> s# mark X)
     (mark# U51(X1, X2) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U51(X1, X2) -> mark# X1, mark# s X -> mark# X)
     (mark# U51(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U51(X1, X2) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U51(X1, X2) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U51(X1, X2) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U51(X1, X2) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U51(X1, X2) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U51(X1, X2) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U51(X1, X2) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U51(X1, X2) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U51(X1, X2) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U51(X1, X2) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U51(X1, X2) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U51(X1, X2) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U51(X1, X2) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U51(X1, X2) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# tt() -> active# tt())
     (mark# U51(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U51(X1, X2) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U51(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U51(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# 0() -> active# 0())
     (mark# U61(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# s X -> s# mark X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# s X -> mark# X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# tt() -> active# tt())
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U61(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# 0() -> active# 0())
     (mark# U64(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# s X -> s# mark X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# s X -> mark# X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# tt() -> active# tt())
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U64(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# plus(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# tt() -> active# tt())
     (mark# plus(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# plus(X1, X2) -> mark# X1, mark# U16 X -> mark# X)
     (mark# plus(X1, X2) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# plus(X1, X2) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# plus(X1, X2) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# U23 X -> mark# X)
     (mark# plus(X1, X2) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# plus(X1, X2) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# plus(X1, X2) -> mark# X1, mark# U32 X -> mark# X)
     (mark# plus(X1, X2) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# plus(X1, X2) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# plus(X1, X2) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# U41 X -> mark# X)
     (mark# plus(X1, X2) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# plus(X1, X2) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# plus(X1, X2) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X1, mark# s X -> mark# X)
     (mark# plus(X1, X2) -> mark# X1, mark# s X -> active# s mark X)
     (mark# plus(X1, X2) -> mark# X1, mark# s X -> s# mark X)
     (mark# plus(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# plus(X1, X2) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# plus(X1, X2) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# plus(X1, X2) -> mark# X1, mark# 0() -> active# 0())
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# tt() -> active# tt())
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# s X -> mark# X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# s X -> s# mark X)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U63(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U63(X1, X2, X3) -> mark# X1, mark# 0() -> active# 0())
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# tt() -> active# tt())
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# s X -> mark# X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# s X -> s# mark X)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U62(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U62(X1, X2, X3) -> mark# X1, mark# 0() -> active# 0())
     (mark# U52(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U52(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# tt() -> active# tt())
     (mark# U52(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U52(X1, X2) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U52(X1, X2) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U52(X1, X2) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U52(X1, X2) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U52(X1, X2) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U52(X1, X2) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U52(X1, X2) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U52(X1, X2) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U52(X1, X2) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U52(X1, X2) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U52(X1, X2) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U52(X1, X2) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U52(X1, X2) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U52(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U52(X1, X2) -> mark# X1, mark# s X -> mark# X)
     (mark# U52(X1, X2) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U52(X1, X2) -> mark# X1, mark# s X -> s# mark X)
     (mark# U52(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U52(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U52(X1, X2) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U52(X1, X2) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U52(X1, X2) -> mark# X1, mark# 0() -> active# 0())
     (mark# U21(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U21(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# tt() -> active# tt())
     (mark# U21(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U21(X1, X2) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U21(X1, X2) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U21(X1, X2) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U21(X1, X2) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U21(X1, X2) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U21(X1, X2) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U21(X1, X2) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U21(X1, X2) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U21(X1, X2) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U21(X1, X2) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U21(X1, X2) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U21(X1, X2) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U21(X1, X2) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U21(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U21(X1, X2) -> mark# X1, mark# s X -> mark# X)
     (mark# U21(X1, X2) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U21(X1, X2) -> mark# X1, mark# s X -> s# mark X)
     (mark# U21(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U21(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U21(X1, X2) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U21(X1, X2) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U21(X1, X2) -> mark# X1, mark# 0() -> active# 0())
     (mark# U15(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U15(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# tt() -> active# tt())
     (mark# U15(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U15(X1, X2) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U15(X1, X2) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U15(X1, X2) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U15(X1, X2) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U15(X1, X2) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U15(X1, X2) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U15(X1, X2) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U15(X1, X2) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U15(X1, X2) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U15(X1, X2) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U15(X1, X2) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U15(X1, X2) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U15(X1, X2) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U15(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U15(X1, X2) -> mark# X1, mark# s X -> mark# X)
     (mark# U15(X1, X2) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U15(X1, X2) -> mark# X1, mark# s X -> s# mark X)
     (mark# U15(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U15(X1, X2) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U15(X1, X2) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U15(X1, X2) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U15(X1, X2) -> mark# X1, mark# 0() -> active# 0())
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# tt() -> active# tt())
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# s X -> mark# X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# s X -> s# mark X)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U13(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U13(X1, X2, X3) -> mark# X1, mark# 0() -> active# 0())
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# isNatKind X -> active# isNatKind X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# tt() -> active# tt())
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# isNat X -> active# isNat X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U16 X -> mark# X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U16 X -> active# U16 mark X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U16 X -> U16# mark X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U23 X -> mark# X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U23 X -> active# U23 mark X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U23 X -> U23# mark X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U32 X -> mark# X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U32 X -> active# U32 mark X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U32 X -> U32# mark X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U41 X -> mark# X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U41 X -> active# U41 mark X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U41 X -> U41# mark X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# s X -> mark# X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# s X -> active# s mark X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# s X -> s# mark X)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X1)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> mark# X2)
     (mark# U12(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U12(X1, X2, X3) -> mark# X1, mark# 0() -> active# 0())
     (active# isNat s V1 -> U21#(isNatKind V1, V1), U21#(mark X1, X2) -> U21#(X1, X2))
     (active# isNat s V1 -> U21#(isNatKind V1, V1), U21#(active X1, X2) -> U21#(X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U12(X1, X2, X3) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# isNatKind X -> active# isNatKind X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U11(X1, X2, X3) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U13(X1, X2, X3) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U14(X1, X2, X3) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U15(X1, X2) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# isNat X -> active# isNat X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U16 X -> mark# X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U16 X -> active# U16 mark X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U16 X -> U16# mark X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U22(X1, X2) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U21(X1, X2) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U23 X -> mark# X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U23 X -> active# U23 mark X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U23 X -> U23# mark X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U32 X -> mark# X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U32 X -> active# U32 mark X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U32 X -> U32# mark X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U31(X1, X2) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U41 X -> mark# X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U41 X -> active# U41 mark X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U41 X -> U41# mark X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U52(X1, X2) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U51(X1, X2) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U62(X1, X2, X3) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U61(X1, X2, X3) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U63(X1, X2, X3) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U64(X1, X2, X3) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# s X -> mark# X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# s X -> active# s mark X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# s X -> s# mark X)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# plus(X1, X2) -> mark# X1)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# plus(X1, X2) -> mark# X2)
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U12(X1, X2, X3) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# isNatKind X -> active# isNatKind X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U11(X1, X2, X3) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U13(X1, X2, X3) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U14(X1, X2, X3) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U15(X1, X2) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# isNat X -> active# isNat X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U16 X -> mark# X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U16 X -> active# U16 mark X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U16 X -> U16# mark X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U22(X1, X2) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U21(X1, X2) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U23 X -> mark# X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U23 X -> active# U23 mark X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U23 X -> U23# mark X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U32 X -> mark# X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U32 X -> active# U32 mark X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U32 X -> U32# mark X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U31(X1, X2) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U41 X -> mark# X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U41 X -> active# U41 mark X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U41 X -> U41# mark X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U52(X1, X2) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U51(X1, X2) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U62(X1, X2, X3) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U61(X1, X2, X3) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U63(X1, X2, X3) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U64(X1, X2, X3) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# s X -> mark# X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# s X -> active# s mark X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# s X -> s# mark X)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# plus(X1, X2) -> mark# X1)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# plus(X1, X2) -> mark# X2)
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U62(tt(), M, N) -> mark# U63(isNat N, M, N), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U12(X1, X2, X3) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# isNatKind X -> active# isNatKind X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U11(X1, X2, X3) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U13(X1, X2, X3) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U14(X1, X2, X3) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U15(X1, X2) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# isNat X -> active# isNat X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U16 X -> mark# X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U16 X -> active# U16 mark X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U16 X -> U16# mark X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U22(X1, X2) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U21(X1, X2) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U23 X -> mark# X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U23 X -> active# U23 mark X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U23 X -> U23# mark X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U32 X -> mark# X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U32 X -> active# U32 mark X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U32 X -> U32# mark X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U31(X1, X2) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U41 X -> mark# X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U41 X -> active# U41 mark X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U41 X -> U41# mark X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U52(X1, X2) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U51(X1, X2) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U62(X1, X2, X3) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U61(X1, X2, X3) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U63(X1, X2, X3) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U64(X1, X2, X3) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# s X -> mark# X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# s X -> active# s mark X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# s X -> s# mark X)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# plus(X1, X2) -> mark# X1)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# plus(X1, X2) -> mark# X2)
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U12(X1, X2, X3) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# isNatKind X -> active# isNatKind X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U11(X1, X2, X3) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U13(X1, X2, X3) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U14(X1, X2, X3) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U15(X1, X2) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# isNat X -> active# isNat X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U16 X -> mark# X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U16 X -> active# U16 mark X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U16 X -> U16# mark X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U22(X1, X2) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U21(X1, X2) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U23 X -> mark# X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U23 X -> active# U23 mark X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U23 X -> U23# mark X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U32 X -> mark# X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U32 X -> active# U32 mark X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U32 X -> U32# mark X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U31(X1, X2) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U41 X -> mark# X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U41 X -> active# U41 mark X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U41 X -> U41# mark X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U52(X1, X2) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U51(X1, X2) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U62(X1, X2, X3) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U61(X1, X2, X3) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U63(X1, X2, X3) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U64(X1, X2, X3) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# s X -> mark# X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# s X -> active# s mark X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# s X -> s# mark X)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# plus(X1, X2) -> mark# X1)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# plus(X1, X2) -> mark# X2)
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNatKind 0() -> mark# tt())
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U15(tt(), V2) -> isNat# V2)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNat s V1 -> isNatKind# V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# isNat 0() -> mark# tt())
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U16 tt() -> mark# tt())
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U22(tt(), V1) -> isNat# V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U23 tt() -> mark# tt())
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U32 tt() -> mark# tt())
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U41 tt() -> mark# tt())
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U52(tt(), N) -> mark# N)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U51(tt(), N) -> isNatKind# N)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U62(tt(), M, N) -> isNat# N)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# plus(N, s M) -> isNat# M)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# plus(N, 0()) -> isNat# N)
     (mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNatKind 0() -> mark# tt())
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U15(tt(), V2) -> isNat# V2)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNat s V1 -> isNatKind# V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# isNat 0() -> mark# tt())
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U16 tt() -> mark# tt())
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U22(tt(), V1) -> isNat# V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U23 tt() -> mark# tt())
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U32 tt() -> mark# tt())
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U41 tt() -> mark# tt())
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U52(tt(), N) -> mark# N)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U51(tt(), N) -> isNatKind# N)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U62(tt(), M, N) -> isNat# N)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# plus(N, s M) -> isNat# M)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# plus(N, 0()) -> isNat# N)
     (mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNatKind 0() -> mark# tt())
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U15(tt(), V2) -> isNat# V2)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNat s V1 -> isNatKind# V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# isNat 0() -> mark# tt())
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U16 tt() -> mark# tt())
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U22(tt(), V1) -> isNat# V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U23 tt() -> mark# tt())
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U32 tt() -> mark# tt())
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U41 tt() -> mark# tt())
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U52(tt(), N) -> mark# N)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U51(tt(), N) -> isNatKind# N)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U62(tt(), M, N) -> isNat# N)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# plus(N, s M) -> isNat# M)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# plus(N, 0()) -> isNat# N)
     (mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNatKind 0() -> mark# tt())
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U15(tt(), V2) -> isNat# V2)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNat s V1 -> isNatKind# V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# isNat 0() -> mark# tt())
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U16 tt() -> mark# tt())
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U22(tt(), V1) -> isNat# V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U23 tt() -> mark# tt())
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U32 tt() -> mark# tt())
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U41 tt() -> mark# tt())
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U52(tt(), N) -> mark# N)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U51(tt(), N) -> isNatKind# N)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U62(tt(), M, N) -> isNat# N)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# plus(N, s M) -> isNat# M)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# plus(N, 0()) -> isNat# N)
     (mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3), active# plus(N, 0()) -> U51#(isNat N, N))
     (plus#(mark X1, X2) -> plus#(X1, X2), plus#(X1, mark X2) -> plus#(X1, X2))
     (plus#(mark X1, X2) -> plus#(X1, X2), plus#(X1, active X2) -> plus#(X1, X2))
     (plus#(mark X1, X2) -> plus#(X1, X2), plus#(mark X1, X2) -> plus#(X1, X2))
     (plus#(mark X1, X2) -> plus#(X1, X2), plus#(active X1, X2) -> plus#(X1, X2))
     (plus#(X1, mark X2) -> plus#(X1, X2), plus#(X1, mark X2) -> plus#(X1, X2))
     (plus#(X1, mark X2) -> plus#(X1, X2), plus#(X1, active X2) -> plus#(X1, X2))
     (plus#(X1, mark X2) -> plus#(X1, X2), plus#(mark X1, X2) -> plus#(X1, X2))
     (plus#(X1, mark X2) -> plus#(X1, X2), plus#(active X1, X2) -> plus#(X1, X2))
     (U51#(mark X1, X2) -> U51#(X1, X2), U51#(X1, mark X2) -> U51#(X1, X2))
     (U51#(mark X1, X2) -> U51#(X1, X2), U51#(X1, active X2) -> U51#(X1, X2))
     (U51#(mark X1, X2) -> U51#(X1, X2), U51#(mark X1, X2) -> U51#(X1, X2))
     (U51#(mark X1, X2) -> U51#(X1, X2), U51#(active X1, X2) -> U51#(X1, X2))
     (U51#(X1, mark X2) -> U51#(X1, X2), U51#(X1, mark X2) -> U51#(X1, X2))
     (U51#(X1, mark X2) -> U51#(X1, X2), U51#(X1, active X2) -> U51#(X1, X2))
     (U51#(X1, mark X2) -> U51#(X1, X2), U51#(mark X1, X2) -> U51#(X1, X2))
     (U51#(X1, mark X2) -> U51#(X1, X2), U51#(active X1, X2) -> U51#(X1, X2))
     (U52#(mark X1, X2) -> U52#(X1, X2), U52#(X1, mark X2) -> U52#(X1, X2))
     (U52#(mark X1, X2) -> U52#(X1, X2), U52#(X1, active X2) -> U52#(X1, X2))
     (U52#(mark X1, X2) -> U52#(X1, X2), U52#(mark X1, X2) -> U52#(X1, X2))
     (U52#(mark X1, X2) -> U52#(X1, X2), U52#(active X1, X2) -> U52#(X1, X2))
     (U52#(X1, mark X2) -> U52#(X1, X2), U52#(X1, mark X2) -> U52#(X1, X2))
     (U52#(X1, mark X2) -> U52#(X1, X2), U52#(X1, active X2) -> U52#(X1, X2))
     (U52#(X1, mark X2) -> U52#(X1, X2), U52#(mark X1, X2) -> U52#(X1, X2))
     (U52#(X1, mark X2) -> U52#(X1, X2), U52#(active X1, X2) -> U52#(X1, X2))
     (U31#(mark X1, X2) -> U31#(X1, X2), U31#(X1, mark X2) -> U31#(X1, X2))
     (U31#(mark X1, X2) -> U31#(X1, X2), U31#(X1, active X2) -> U31#(X1, X2))
     (U31#(mark X1, X2) -> U31#(X1, X2), U31#(mark X1, X2) -> U31#(X1, X2))
     (U31#(mark X1, X2) -> U31#(X1, X2), U31#(active X1, X2) -> U31#(X1, X2))
     (U31#(X1, mark X2) -> U31#(X1, X2), U31#(X1, mark X2) -> U31#(X1, X2))
     (U31#(X1, mark X2) -> U31#(X1, X2), U31#(X1, active X2) -> U31#(X1, X2))
     (U31#(X1, mark X2) -> U31#(X1, X2), U31#(mark X1, X2) -> U31#(X1, X2))
     (U31#(X1, mark X2) -> U31#(X1, X2), U31#(active X1, X2) -> U31#(X1, X2))
     (U21#(mark X1, X2) -> U21#(X1, X2), U21#(X1, mark X2) -> U21#(X1, X2))
     (U21#(mark X1, X2) -> U21#(X1, X2), U21#(X1, active X2) -> U21#(X1, X2))
     (U21#(mark X1, X2) -> U21#(X1, X2), U21#(mark X1, X2) -> U21#(X1, X2))
     (U21#(mark X1, X2) -> U21#(X1, X2), U21#(active X1, X2) -> U21#(X1, X2))
     (U21#(X1, mark X2) -> U21#(X1, X2), U21#(X1, mark X2) -> U21#(X1, X2))
     (U21#(X1, mark X2) -> U21#(X1, X2), U21#(X1, active X2) -> U21#(X1, X2))
     (U21#(X1, mark X2) -> U21#(X1, X2), U21#(mark X1, X2) -> U21#(X1, X2))
     (U21#(X1, mark X2) -> U21#(X1, X2), U21#(active X1, X2) -> U21#(X1, X2))
     (U22#(mark X1, X2) -> U22#(X1, X2), U22#(X1, mark X2) -> U22#(X1, X2))
     (U22#(mark X1, X2) -> U22#(X1, X2), U22#(X1, active X2) -> U22#(X1, X2))
     (U22#(mark X1, X2) -> U22#(X1, X2), U22#(mark X1, X2) -> U22#(X1, X2))
     (U22#(mark X1, X2) -> U22#(X1, X2), U22#(active X1, X2) -> U22#(X1, X2))
     (U22#(X1, mark X2) -> U22#(X1, X2), U22#(X1, mark X2) -> U22#(X1, X2))
     (U22#(X1, mark X2) -> U22#(X1, X2), U22#(X1, active X2) -> U22#(X1, X2))
     (U22#(X1, mark X2) -> U22#(X1, X2), U22#(mark X1, X2) -> U22#(X1, X2))
     (U22#(X1, mark X2) -> U22#(X1, X2), U22#(active X1, X2) -> U22#(X1, X2))
     (U15#(mark X1, X2) -> U15#(X1, X2), U15#(X1, mark X2) -> U15#(X1, X2))
     (U15#(mark X1, X2) -> U15#(X1, X2), U15#(X1, active X2) -> U15#(X1, X2))
     (U15#(mark X1, X2) -> U15#(X1, X2), U15#(mark X1, X2) -> U15#(X1, X2))
     (U15#(mark X1, X2) -> U15#(X1, X2), U15#(active X1, X2) -> U15#(X1, X2))
     (U15#(X1, mark X2) -> U15#(X1, X2), U15#(X1, mark X2) -> U15#(X1, X2))
     (U15#(X1, mark X2) -> U15#(X1, X2), U15#(X1, active X2) -> U15#(X1, X2))
     (U15#(X1, mark X2) -> U15#(X1, X2), U15#(mark X1, X2) -> U15#(X1, X2))
     (U15#(X1, mark X2) -> U15#(X1, X2), U15#(active X1, X2) -> U15#(X1, X2))
     (active# U22(tt(), V1) -> U23# isNat V1, U23# mark X -> U23# X)
     (active# U22(tt(), V1) -> U23# isNat V1, U23# active X -> U23# X)
     (active# U31(tt(), V2) -> U32# isNatKind V2, U32# mark X -> U32# X)
     (active# U31(tt(), V2) -> U32# isNatKind V2, U32# active X -> U32# X)
     (mark# s X -> s# mark X, s# mark X -> s# X)
     (mark# s X -> s# mark X, s# active X -> s# X)
     (mark# U32 X -> U32# mark X, U32# mark X -> U32# X)
     (mark# U32 X -> U32# mark X, U32# active X -> U32# X)
     (mark# U16 X -> U16# mark X, U16# mark X -> U16# X)
     (mark# U16 X -> U16# mark X, U16# active X -> U16# X)
     (mark# isNatKind X -> active# isNatKind X, active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# isNatKind X -> active# isNatKind X, active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# isNatKind X -> active# isNatKind X, active# isNatKind s V1 -> isNatKind# V1)
     (mark# isNatKind X -> active# isNatKind X, active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# isNatKind X -> active# isNatKind X, active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# isNatKind X -> active# isNatKind X, active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# isNatKind 0() -> mark# tt())
     (mark# isNatKind X -> active# isNatKind X, active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# isNatKind X -> active# isNatKind X, active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# isNatKind X -> active# isNatKind X, active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# isNatKind X -> active# isNatKind X, active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# isNatKind X -> active# isNatKind X, active# U15(tt(), V2) -> isNat# V2)
     (mark# isNatKind X -> active# isNatKind X, active# U15(tt(), V2) -> U16# isNat V2)
     (mark# isNatKind X -> active# isNatKind X, active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# isNatKind X -> active# isNatKind X, active# isNat s V1 -> isNatKind# V1)
     (mark# isNatKind X -> active# isNatKind X, active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# isNatKind X -> active# isNatKind X, active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# isNatKind X -> active# isNatKind X, active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# isNatKind X -> active# isNatKind X, active# isNat 0() -> mark# tt())
     (mark# isNatKind X -> active# isNatKind X, active# U16 tt() -> mark# tt())
     (mark# isNatKind X -> active# isNatKind X, active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# isNatKind X -> active# isNatKind X, active# U22(tt(), V1) -> isNat# V1)
     (mark# isNatKind X -> active# isNatKind X, active# U22(tt(), V1) -> U23# isNat V1)
     (mark# isNatKind X -> active# isNatKind X, active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# isNatKind X -> active# isNatKind X, active# U21(tt(), V1) -> isNatKind# V1)
     (mark# isNatKind X -> active# isNatKind X, active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# isNatKind X -> active# isNatKind X, active# U23 tt() -> mark# tt())
     (mark# isNatKind X -> active# isNatKind X, active# U32 tt() -> mark# tt())
     (mark# isNatKind X -> active# isNatKind X, active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# isNatKind X -> active# isNatKind X, active# U31(tt(), V2) -> isNatKind# V2)
     (mark# isNatKind X -> active# isNatKind X, active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# isNatKind X -> active# isNatKind X, active# U41 tt() -> mark# tt())
     (mark# isNatKind X -> active# isNatKind X, active# U52(tt(), N) -> mark# N)
     (mark# isNatKind X -> active# isNatKind X, active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# isNatKind X -> active# isNatKind X, active# U51(tt(), N) -> isNatKind# N)
     (mark# isNatKind X -> active# isNatKind X, active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# isNatKind X -> active# isNatKind X, active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# isNatKind X -> active# isNatKind X, active# U62(tt(), M, N) -> isNat# N)
     (mark# isNatKind X -> active# isNatKind X, active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# isNatKind X -> active# isNatKind X, active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# isNatKind X -> active# isNatKind X, active# U61(tt(), M, N) -> isNatKind# M)
     (mark# isNatKind X -> active# isNatKind X, active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# isNatKind X -> active# isNatKind X, active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# isNatKind X -> active# isNatKind X, active# U63(tt(), M, N) -> isNatKind# N)
     (mark# isNatKind X -> active# isNatKind X, active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# isNatKind X -> active# isNatKind X, active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# isNatKind X -> active# isNatKind X, active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# isNatKind X -> active# isNatKind X, active# U64(tt(), M, N) -> plus#(N, M))
     (mark# isNatKind X -> active# isNatKind X, active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# isNatKind X -> active# isNatKind X, active# plus(N, s M) -> isNat# M)
     (mark# isNatKind X -> active# isNatKind X, active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# isNatKind X -> active# isNatKind X, active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# isNatKind X -> active# isNatKind X, active# plus(N, 0()) -> isNat# N)
     (mark# isNatKind X -> active# isNatKind X, active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U52(X1, X2) -> U52#(mark X1, X2), U52#(mark X1, X2) -> U52#(X1, X2))
     (mark# U52(X1, X2) -> U52#(mark X1, X2), U52#(active X1, X2) -> U52#(X1, X2))
     (mark# U21(X1, X2) -> U21#(mark X1, X2), U21#(mark X1, X2) -> U21#(X1, X2))
     (mark# U21(X1, X2) -> U21#(mark X1, X2), U21#(active X1, X2) -> U21#(X1, X2))
     (mark# U15(X1, X2) -> U15#(mark X1, X2), U15#(mark X1, X2) -> U15#(X1, X2))
     (mark# U15(X1, X2) -> U15#(mark X1, X2), U15#(active X1, X2) -> U15#(X1, X2))
     (active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2), U11#(mark X1, X2, X3) -> U11#(X1, X2, X3))
     (active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2), U11#(active X1, X2, X3) -> U11#(X1, X2, X3))
     (active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2), U12#(mark X1, X2, X3) -> U12#(X1, X2, X3))
     (active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2), U12#(active X1, X2, X3) -> U12#(X1, X2, X3))
     (s# active X -> s# X, s# mark X -> s# X)
     (s# active X -> s# X, s# active X -> s# X)
     (U41# active X -> U41# X, U41# mark X -> U41# X)
     (U41# active X -> U41# X, U41# active X -> U41# X)
     (U32# active X -> U32# X, U32# mark X -> U32# X)
     (U32# active X -> U32# X, U32# active X -> U32# X)
     (U23# active X -> U23# X, U23# mark X -> U23# X)
     (U23# active X -> U23# X, U23# active X -> U23# X)
     (U16# active X -> U16# X, U16# mark X -> U16# X)
     (U16# active X -> U16# X, U16# active X -> U16# X)
     (isNat# active X -> isNat# X, isNat# mark X -> isNat# X)
     (isNat# active X -> isNat# X, isNat# active X -> isNat# X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U12(X1, X2, X3) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# isNatKind X -> active# isNatKind X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U11(X1, X2, X3) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U13(X1, X2, X3) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U14(X1, X2, X3) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U15(X1, X2) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# isNat X -> active# isNat X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U16 X -> mark# X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U16 X -> active# U16 mark X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U16 X -> U16# mark X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U22(X1, X2) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U21(X1, X2) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U23 X -> mark# X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U23 X -> active# U23 mark X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U23 X -> U23# mark X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U32 X -> mark# X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U32 X -> active# U32 mark X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U32 X -> U32# mark X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U31(X1, X2) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U41 X -> mark# X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U41 X -> active# U41 mark X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U41 X -> U41# mark X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U52(X1, X2) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U51(X1, X2) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U62(X1, X2, X3) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U61(X1, X2, X3) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U63(X1, X2, X3) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U64(X1, X2, X3) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# s X -> mark# X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# s X -> active# s mark X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# s X -> s# mark X)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# plus(X1, X2) -> mark# X1)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# plus(X1, X2) -> mark# X2)
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U64(tt(), M, N) -> mark# s plus(N, M), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U12(X1, X2, X3) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# isNatKind X -> active# isNatKind X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U11(X1, X2, X3) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U13(X1, X2, X3) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U14(X1, X2, X3) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U15(X1, X2) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# isNat X -> active# isNat X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U16 X -> mark# X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U16 X -> active# U16 mark X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U16 X -> U16# mark X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U22(X1, X2) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U21(X1, X2) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U23 X -> mark# X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U23 X -> active# U23 mark X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U23 X -> U23# mark X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U32 X -> mark# X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U32 X -> active# U32 mark X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U32 X -> U32# mark X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U31(X1, X2) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U41 X -> mark# X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U41 X -> active# U41 mark X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U41 X -> U41# mark X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U52(X1, X2) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U51(X1, X2) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U62(X1, X2, X3) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U61(X1, X2, X3) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U63(X1, X2, X3) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U64(X1, X2, X3) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# s X -> mark# X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# s X -> active# s mark X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# s X -> s# mark X)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# plus(X1, X2) -> mark# X1)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# plus(X1, X2) -> mark# X2)
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U22(tt(), V1) -> mark# U23 isNat V1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U12(X1, X2, X3) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# isNatKind X -> active# isNatKind X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U11(X1, X2, X3) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U13(X1, X2, X3) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U14(X1, X2, X3) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U15(X1, X2) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# isNat X -> active# isNat X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U16 X -> mark# X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U16 X -> active# U16 mark X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U16 X -> U16# mark X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U22(X1, X2) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U21(X1, X2) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U23 X -> mark# X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U23 X -> active# U23 mark X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U23 X -> U23# mark X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U32 X -> mark# X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U32 X -> active# U32 mark X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U32 X -> U32# mark X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U31(X1, X2) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U41 X -> mark# X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U41 X -> active# U41 mark X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U41 X -> U41# mark X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U52(X1, X2) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U51(X1, X2) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U62(X1, X2, X3) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U61(X1, X2, X3) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U63(X1, X2, X3) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U64(X1, X2, X3) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# s X -> mark# X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# s X -> active# s mark X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# s X -> s# mark X)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# plus(X1, X2) -> mark# X1)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# plus(X1, X2) -> mark# X2)
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# isNatKind s V1 -> mark# U41 isNatKind V1, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (isNatKind# mark X -> isNatKind# X, isNatKind# mark X -> isNatKind# X)
     (isNatKind# mark X -> isNatKind# X, isNatKind# active X -> isNatKind# X)
     (mark# s X -> mark# X, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# s X -> mark# X, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# isNatKind X -> active# isNatKind X)
     (mark# s X -> mark# X, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# s X -> mark# X, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# tt() -> active# tt())
     (mark# s X -> mark# X, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# s X -> mark# X, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# s X -> mark# X, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U15(X1, X2) -> mark# X1)
     (mark# s X -> mark# X, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# s X -> mark# X, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# s X -> mark# X, mark# isNat X -> active# isNat X)
     (mark# s X -> mark# X, mark# U16 X -> mark# X)
     (mark# s X -> mark# X, mark# U16 X -> active# U16 mark X)
     (mark# s X -> mark# X, mark# U16 X -> U16# mark X)
     (mark# s X -> mark# X, mark# U22(X1, X2) -> mark# X1)
     (mark# s X -> mark# X, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# s X -> mark# X, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# s X -> mark# X, mark# U21(X1, X2) -> mark# X1)
     (mark# s X -> mark# X, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# s X -> mark# X, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# s X -> mark# X, mark# U23 X -> mark# X)
     (mark# s X -> mark# X, mark# U23 X -> active# U23 mark X)
     (mark# s X -> mark# X, mark# U23 X -> U23# mark X)
     (mark# s X -> mark# X, mark# U32 X -> mark# X)
     (mark# s X -> mark# X, mark# U32 X -> active# U32 mark X)
     (mark# s X -> mark# X, mark# U32 X -> U32# mark X)
     (mark# s X -> mark# X, mark# U31(X1, X2) -> mark# X1)
     (mark# s X -> mark# X, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# s X -> mark# X, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# s X -> mark# X, mark# U41 X -> mark# X)
     (mark# s X -> mark# X, mark# U41 X -> active# U41 mark X)
     (mark# s X -> mark# X, mark# U41 X -> U41# mark X)
     (mark# s X -> mark# X, mark# U52(X1, X2) -> mark# X1)
     (mark# s X -> mark# X, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# s X -> mark# X, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# s X -> mark# X, mark# U51(X1, X2) -> mark# X1)
     (mark# s X -> mark# X, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# s X -> mark# X, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# s X -> mark# X, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# s X -> mark# X, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# s X -> mark# X, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# s X -> mark# X, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# s X -> mark# X, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# s X -> mark# X, mark# s X -> mark# X)
     (mark# s X -> mark# X, mark# s X -> active# s mark X)
     (mark# s X -> mark# X, mark# s X -> s# mark X)
     (mark# s X -> mark# X, mark# plus(X1, X2) -> mark# X1)
     (mark# s X -> mark# X, mark# plus(X1, X2) -> mark# X2)
     (mark# s X -> mark# X, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# s X -> mark# X, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# s X -> mark# X, mark# 0() -> active# 0())
     (mark# U41 X -> mark# X, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# isNatKind X -> active# isNatKind X)
     (mark# U41 X -> mark# X, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# tt() -> active# tt())
     (mark# U41 X -> mark# X, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U15(X1, X2) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U41 X -> mark# X, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U41 X -> mark# X, mark# isNat X -> active# isNat X)
     (mark# U41 X -> mark# X, mark# U16 X -> mark# X)
     (mark# U41 X -> mark# X, mark# U16 X -> active# U16 mark X)
     (mark# U41 X -> mark# X, mark# U16 X -> U16# mark X)
     (mark# U41 X -> mark# X, mark# U22(X1, X2) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U41 X -> mark# X, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U41 X -> mark# X, mark# U21(X1, X2) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U41 X -> mark# X, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U41 X -> mark# X, mark# U23 X -> mark# X)
     (mark# U41 X -> mark# X, mark# U23 X -> active# U23 mark X)
     (mark# U41 X -> mark# X, mark# U23 X -> U23# mark X)
     (mark# U41 X -> mark# X, mark# U32 X -> mark# X)
     (mark# U41 X -> mark# X, mark# U32 X -> active# U32 mark X)
     (mark# U41 X -> mark# X, mark# U32 X -> U32# mark X)
     (mark# U41 X -> mark# X, mark# U31(X1, X2) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U41 X -> mark# X, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U41 X -> mark# X, mark# U41 X -> mark# X)
     (mark# U41 X -> mark# X, mark# U41 X -> active# U41 mark X)
     (mark# U41 X -> mark# X, mark# U41 X -> U41# mark X)
     (mark# U41 X -> mark# X, mark# U52(X1, X2) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U41 X -> mark# X, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U41 X -> mark# X, mark# U51(X1, X2) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U41 X -> mark# X, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U41 X -> mark# X, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U41 X -> mark# X, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U41 X -> mark# X, mark# s X -> mark# X)
     (mark# U41 X -> mark# X, mark# s X -> active# s mark X)
     (mark# U41 X -> mark# X, mark# s X -> s# mark X)
     (mark# U41 X -> mark# X, mark# plus(X1, X2) -> mark# X1)
     (mark# U41 X -> mark# X, mark# plus(X1, X2) -> mark# X2)
     (mark# U41 X -> mark# X, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U41 X -> mark# X, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U41 X -> mark# X, mark# 0() -> active# 0())
     (mark# U32 X -> mark# X, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# isNatKind X -> active# isNatKind X)
     (mark# U32 X -> mark# X, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# tt() -> active# tt())
     (mark# U32 X -> mark# X, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U15(X1, X2) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U32 X -> mark# X, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U32 X -> mark# X, mark# isNat X -> active# isNat X)
     (mark# U32 X -> mark# X, mark# U16 X -> mark# X)
     (mark# U32 X -> mark# X, mark# U16 X -> active# U16 mark X)
     (mark# U32 X -> mark# X, mark# U16 X -> U16# mark X)
     (mark# U32 X -> mark# X, mark# U22(X1, X2) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U32 X -> mark# X, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U32 X -> mark# X, mark# U21(X1, X2) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U32 X -> mark# X, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U32 X -> mark# X, mark# U23 X -> mark# X)
     (mark# U32 X -> mark# X, mark# U23 X -> active# U23 mark X)
     (mark# U32 X -> mark# X, mark# U23 X -> U23# mark X)
     (mark# U32 X -> mark# X, mark# U32 X -> mark# X)
     (mark# U32 X -> mark# X, mark# U32 X -> active# U32 mark X)
     (mark# U32 X -> mark# X, mark# U32 X -> U32# mark X)
     (mark# U32 X -> mark# X, mark# U31(X1, X2) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U32 X -> mark# X, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U32 X -> mark# X, mark# U41 X -> mark# X)
     (mark# U32 X -> mark# X, mark# U41 X -> active# U41 mark X)
     (mark# U32 X -> mark# X, mark# U41 X -> U41# mark X)
     (mark# U32 X -> mark# X, mark# U52(X1, X2) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U32 X -> mark# X, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U32 X -> mark# X, mark# U51(X1, X2) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U32 X -> mark# X, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U32 X -> mark# X, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U32 X -> mark# X, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U32 X -> mark# X, mark# s X -> mark# X)
     (mark# U32 X -> mark# X, mark# s X -> active# s mark X)
     (mark# U32 X -> mark# X, mark# s X -> s# mark X)
     (mark# U32 X -> mark# X, mark# plus(X1, X2) -> mark# X1)
     (mark# U32 X -> mark# X, mark# plus(X1, X2) -> mark# X2)
     (mark# U32 X -> mark# X, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U32 X -> mark# X, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U32 X -> mark# X, mark# 0() -> active# 0())
     (mark# U23 X -> mark# X, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# isNatKind X -> active# isNatKind X)
     (mark# U23 X -> mark# X, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# tt() -> active# tt())
     (mark# U23 X -> mark# X, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U15(X1, X2) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U23 X -> mark# X, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U23 X -> mark# X, mark# isNat X -> active# isNat X)
     (mark# U23 X -> mark# X, mark# U16 X -> mark# X)
     (mark# U23 X -> mark# X, mark# U16 X -> active# U16 mark X)
     (mark# U23 X -> mark# X, mark# U16 X -> U16# mark X)
     (mark# U23 X -> mark# X, mark# U22(X1, X2) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U23 X -> mark# X, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U23 X -> mark# X, mark# U21(X1, X2) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U23 X -> mark# X, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U23 X -> mark# X, mark# U23 X -> mark# X)
     (mark# U23 X -> mark# X, mark# U23 X -> active# U23 mark X)
     (mark# U23 X -> mark# X, mark# U23 X -> U23# mark X)
     (mark# U23 X -> mark# X, mark# U32 X -> mark# X)
     (mark# U23 X -> mark# X, mark# U32 X -> active# U32 mark X)
     (mark# U23 X -> mark# X, mark# U32 X -> U32# mark X)
     (mark# U23 X -> mark# X, mark# U31(X1, X2) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U23 X -> mark# X, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U23 X -> mark# X, mark# U41 X -> mark# X)
     (mark# U23 X -> mark# X, mark# U41 X -> active# U41 mark X)
     (mark# U23 X -> mark# X, mark# U41 X -> U41# mark X)
     (mark# U23 X -> mark# X, mark# U52(X1, X2) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U23 X -> mark# X, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U23 X -> mark# X, mark# U51(X1, X2) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U23 X -> mark# X, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U23 X -> mark# X, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U23 X -> mark# X, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U23 X -> mark# X, mark# s X -> mark# X)
     (mark# U23 X -> mark# X, mark# s X -> active# s mark X)
     (mark# U23 X -> mark# X, mark# s X -> s# mark X)
     (mark# U23 X -> mark# X, mark# plus(X1, X2) -> mark# X1)
     (mark# U23 X -> mark# X, mark# plus(X1, X2) -> mark# X2)
     (mark# U23 X -> mark# X, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U23 X -> mark# X, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U23 X -> mark# X, mark# 0() -> active# 0())
     (mark# U16 X -> mark# X, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# isNatKind X -> active# isNatKind X)
     (mark# U16 X -> mark# X, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# tt() -> active# tt())
     (mark# U16 X -> mark# X, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U15(X1, X2) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# U16 X -> mark# X, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# U16 X -> mark# X, mark# isNat X -> active# isNat X)
     (mark# U16 X -> mark# X, mark# U16 X -> mark# X)
     (mark# U16 X -> mark# X, mark# U16 X -> active# U16 mark X)
     (mark# U16 X -> mark# X, mark# U16 X -> U16# mark X)
     (mark# U16 X -> mark# X, mark# U22(X1, X2) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# U16 X -> mark# X, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# U16 X -> mark# X, mark# U21(X1, X2) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# U16 X -> mark# X, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# U16 X -> mark# X, mark# U23 X -> mark# X)
     (mark# U16 X -> mark# X, mark# U23 X -> active# U23 mark X)
     (mark# U16 X -> mark# X, mark# U23 X -> U23# mark X)
     (mark# U16 X -> mark# X, mark# U32 X -> mark# X)
     (mark# U16 X -> mark# X, mark# U32 X -> active# U32 mark X)
     (mark# U16 X -> mark# X, mark# U32 X -> U32# mark X)
     (mark# U16 X -> mark# X, mark# U31(X1, X2) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# U16 X -> mark# X, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# U16 X -> mark# X, mark# U41 X -> mark# X)
     (mark# U16 X -> mark# X, mark# U41 X -> active# U41 mark X)
     (mark# U16 X -> mark# X, mark# U41 X -> U41# mark X)
     (mark# U16 X -> mark# X, mark# U52(X1, X2) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# U16 X -> mark# X, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# U16 X -> mark# X, mark# U51(X1, X2) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# U16 X -> mark# X, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# U16 X -> mark# X, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# U16 X -> mark# X, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# U16 X -> mark# X, mark# s X -> mark# X)
     (mark# U16 X -> mark# X, mark# s X -> active# s mark X)
     (mark# U16 X -> mark# X, mark# s X -> s# mark X)
     (mark# U16 X -> mark# X, mark# plus(X1, X2) -> mark# X1)
     (mark# U16 X -> mark# X, mark# plus(X1, X2) -> mark# X2)
     (mark# U16 X -> mark# X, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# U16 X -> mark# X, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U16 X -> mark# X, mark# 0() -> active# 0())
     (active# U63(tt(), M, N) -> U64#(isNatKind N, M, N), U64#(mark X1, X2, X3) -> U64#(X1, X2, X3))
     (active# U63(tt(), M, N) -> U64#(isNatKind N, M, N), U64#(active X1, X2, X3) -> U64#(X1, X2, X3))
     (active# U62(tt(), M, N) -> U63#(isNat N, M, N), U63#(mark X1, X2, X3) -> U63#(X1, X2, X3))
     (active# U62(tt(), M, N) -> U63#(isNat N, M, N), U63#(active X1, X2, X3) -> U63#(X1, X2, X3))
     (U64#(active X1, X2, X3) -> U64#(X1, X2, X3), U64#(X1, X2, mark X3) -> U64#(X1, X2, X3))
     (U64#(active X1, X2, X3) -> U64#(X1, X2, X3), U64#(X1, X2, active X3) -> U64#(X1, X2, X3))
     (U64#(active X1, X2, X3) -> U64#(X1, X2, X3), U64#(X1, mark X2, X3) -> U64#(X1, X2, X3))
     (U64#(active X1, X2, X3) -> U64#(X1, X2, X3), U64#(X1, active X2, X3) -> U64#(X1, X2, X3))
     (U64#(active X1, X2, X3) -> U64#(X1, X2, X3), U64#(mark X1, X2, X3) -> U64#(X1, X2, X3))
     (U64#(active X1, X2, X3) -> U64#(X1, X2, X3), U64#(active X1, X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, active X2, X3) -> U64#(X1, X2, X3), U64#(X1, X2, mark X3) -> U64#(X1, X2, X3))
     (U64#(X1, active X2, X3) -> U64#(X1, X2, X3), U64#(X1, X2, active X3) -> U64#(X1, X2, X3))
     (U64#(X1, active X2, X3) -> U64#(X1, X2, X3), U64#(X1, mark X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, active X2, X3) -> U64#(X1, X2, X3), U64#(X1, active X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, active X2, X3) -> U64#(X1, X2, X3), U64#(mark X1, X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, active X2, X3) -> U64#(X1, X2, X3), U64#(active X1, X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, X2, active X3) -> U64#(X1, X2, X3), U64#(X1, X2, mark X3) -> U64#(X1, X2, X3))
     (U64#(X1, X2, active X3) -> U64#(X1, X2, X3), U64#(X1, X2, active X3) -> U64#(X1, X2, X3))
     (U64#(X1, X2, active X3) -> U64#(X1, X2, X3), U64#(X1, mark X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, X2, active X3) -> U64#(X1, X2, X3), U64#(X1, active X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, X2, active X3) -> U64#(X1, X2, X3), U64#(mark X1, X2, X3) -> U64#(X1, X2, X3))
     (U64#(X1, X2, active X3) -> U64#(X1, X2, X3), U64#(active X1, X2, X3) -> U64#(X1, X2, X3))
     (U63#(active X1, X2, X3) -> U63#(X1, X2, X3), U63#(X1, X2, mark X3) -> U63#(X1, X2, X3))
     (U63#(active X1, X2, X3) -> U63#(X1, X2, X3), U63#(X1, X2, active X3) -> U63#(X1, X2, X3))
     (U63#(active X1, X2, X3) -> U63#(X1, X2, X3), U63#(X1, mark X2, X3) -> U63#(X1, X2, X3))
     (U63#(active X1, X2, X3) -> U63#(X1, X2, X3), U63#(X1, active X2, X3) -> U63#(X1, X2, X3))
     (U63#(active X1, X2, X3) -> U63#(X1, X2, X3), U63#(mark X1, X2, X3) -> U63#(X1, X2, X3))
     (U63#(active X1, X2, X3) -> U63#(X1, X2, X3), U63#(active X1, X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, active X2, X3) -> U63#(X1, X2, X3), U63#(X1, X2, mark X3) -> U63#(X1, X2, X3))
     (U63#(X1, active X2, X3) -> U63#(X1, X2, X3), U63#(X1, X2, active X3) -> U63#(X1, X2, X3))
     (U63#(X1, active X2, X3) -> U63#(X1, X2, X3), U63#(X1, mark X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, active X2, X3) -> U63#(X1, X2, X3), U63#(X1, active X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, active X2, X3) -> U63#(X1, X2, X3), U63#(mark X1, X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, active X2, X3) -> U63#(X1, X2, X3), U63#(active X1, X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, X2, active X3) -> U63#(X1, X2, X3), U63#(X1, X2, mark X3) -> U63#(X1, X2, X3))
     (U63#(X1, X2, active X3) -> U63#(X1, X2, X3), U63#(X1, X2, active X3) -> U63#(X1, X2, X3))
     (U63#(X1, X2, active X3) -> U63#(X1, X2, X3), U63#(X1, mark X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, X2, active X3) -> U63#(X1, X2, X3), U63#(X1, active X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, X2, active X3) -> U63#(X1, X2, X3), U63#(mark X1, X2, X3) -> U63#(X1, X2, X3))
     (U63#(X1, X2, active X3) -> U63#(X1, X2, X3), U63#(active X1, X2, X3) -> U63#(X1, X2, X3))
     (U61#(active X1, X2, X3) -> U61#(X1, X2, X3), U61#(X1, X2, mark X3) -> U61#(X1, X2, X3))
     (U61#(active X1, X2, X3) -> U61#(X1, X2, X3), U61#(X1, X2, active X3) -> U61#(X1, X2, X3))
     (U61#(active X1, X2, X3) -> U61#(X1, X2, X3), U61#(X1, mark X2, X3) -> U61#(X1, X2, X3))
     (U61#(active X1, X2, X3) -> U61#(X1, X2, X3), U61#(X1, active X2, X3) -> U61#(X1, X2, X3))
     (U61#(active X1, X2, X3) -> U61#(X1, X2, X3), U61#(mark X1, X2, X3) -> U61#(X1, X2, X3))
     (U61#(active X1, X2, X3) -> U61#(X1, X2, X3), U61#(active X1, X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, active X2, X3) -> U61#(X1, X2, X3), U61#(X1, X2, mark X3) -> U61#(X1, X2, X3))
     (U61#(X1, active X2, X3) -> U61#(X1, X2, X3), U61#(X1, X2, active X3) -> U61#(X1, X2, X3))
     (U61#(X1, active X2, X3) -> U61#(X1, X2, X3), U61#(X1, mark X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, active X2, X3) -> U61#(X1, X2, X3), U61#(X1, active X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, active X2, X3) -> U61#(X1, X2, X3), U61#(mark X1, X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, active X2, X3) -> U61#(X1, X2, X3), U61#(active X1, X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, X2, active X3) -> U61#(X1, X2, X3), U61#(X1, X2, mark X3) -> U61#(X1, X2, X3))
     (U61#(X1, X2, active X3) -> U61#(X1, X2, X3), U61#(X1, X2, active X3) -> U61#(X1, X2, X3))
     (U61#(X1, X2, active X3) -> U61#(X1, X2, X3), U61#(X1, mark X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, X2, active X3) -> U61#(X1, X2, X3), U61#(X1, active X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, X2, active X3) -> U61#(X1, X2, X3), U61#(mark X1, X2, X3) -> U61#(X1, X2, X3))
     (U61#(X1, X2, active X3) -> U61#(X1, X2, X3), U61#(active X1, X2, X3) -> U61#(X1, X2, X3))
     (U62#(active X1, X2, X3) -> U62#(X1, X2, X3), U62#(X1, X2, mark X3) -> U62#(X1, X2, X3))
     (U62#(active X1, X2, X3) -> U62#(X1, X2, X3), U62#(X1, X2, active X3) -> U62#(X1, X2, X3))
     (U62#(active X1, X2, X3) -> U62#(X1, X2, X3), U62#(X1, mark X2, X3) -> U62#(X1, X2, X3))
     (U62#(active X1, X2, X3) -> U62#(X1, X2, X3), U62#(X1, active X2, X3) -> U62#(X1, X2, X3))
     (U62#(active X1, X2, X3) -> U62#(X1, X2, X3), U62#(mark X1, X2, X3) -> U62#(X1, X2, X3))
     (U62#(active X1, X2, X3) -> U62#(X1, X2, X3), U62#(active X1, X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, active X2, X3) -> U62#(X1, X2, X3), U62#(X1, X2, mark X3) -> U62#(X1, X2, X3))
     (U62#(X1, active X2, X3) -> U62#(X1, X2, X3), U62#(X1, X2, active X3) -> U62#(X1, X2, X3))
     (U62#(X1, active X2, X3) -> U62#(X1, X2, X3), U62#(X1, mark X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, active X2, X3) -> U62#(X1, X2, X3), U62#(X1, active X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, active X2, X3) -> U62#(X1, X2, X3), U62#(mark X1, X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, active X2, X3) -> U62#(X1, X2, X3), U62#(active X1, X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, X2, active X3) -> U62#(X1, X2, X3), U62#(X1, X2, mark X3) -> U62#(X1, X2, X3))
     (U62#(X1, X2, active X3) -> U62#(X1, X2, X3), U62#(X1, X2, active X3) -> U62#(X1, X2, X3))
     (U62#(X1, X2, active X3) -> U62#(X1, X2, X3), U62#(X1, mark X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, X2, active X3) -> U62#(X1, X2, X3), U62#(X1, active X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, X2, active X3) -> U62#(X1, X2, X3), U62#(mark X1, X2, X3) -> U62#(X1, X2, X3))
     (U62#(X1, X2, active X3) -> U62#(X1, X2, X3), U62#(active X1, X2, X3) -> U62#(X1, X2, X3))
     (U14#(active X1, X2, X3) -> U14#(X1, X2, X3), U14#(X1, X2, mark X3) -> U14#(X1, X2, X3))
     (U14#(active X1, X2, X3) -> U14#(X1, X2, X3), U14#(X1, X2, active X3) -> U14#(X1, X2, X3))
     (U14#(active X1, X2, X3) -> U14#(X1, X2, X3), U14#(X1, mark X2, X3) -> U14#(X1, X2, X3))
     (U14#(active X1, X2, X3) -> U14#(X1, X2, X3), U14#(X1, active X2, X3) -> U14#(X1, X2, X3))
     (U14#(active X1, X2, X3) -> U14#(X1, X2, X3), U14#(mark X1, X2, X3) -> U14#(X1, X2, X3))
     (U14#(active X1, X2, X3) -> U14#(X1, X2, X3), U14#(active X1, X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, active X2, X3) -> U14#(X1, X2, X3), U14#(X1, X2, mark X3) -> U14#(X1, X2, X3))
     (U14#(X1, active X2, X3) -> U14#(X1, X2, X3), U14#(X1, X2, active X3) -> U14#(X1, X2, X3))
     (U14#(X1, active X2, X3) -> U14#(X1, X2, X3), U14#(X1, mark X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, active X2, X3) -> U14#(X1, X2, X3), U14#(X1, active X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, active X2, X3) -> U14#(X1, X2, X3), U14#(mark X1, X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, active X2, X3) -> U14#(X1, X2, X3), U14#(active X1, X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, X2, active X3) -> U14#(X1, X2, X3), U14#(X1, X2, mark X3) -> U14#(X1, X2, X3))
     (U14#(X1, X2, active X3) -> U14#(X1, X2, X3), U14#(X1, X2, active X3) -> U14#(X1, X2, X3))
     (U14#(X1, X2, active X3) -> U14#(X1, X2, X3), U14#(X1, mark X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, X2, active X3) -> U14#(X1, X2, X3), U14#(X1, active X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, X2, active X3) -> U14#(X1, X2, X3), U14#(mark X1, X2, X3) -> U14#(X1, X2, X3))
     (U14#(X1, X2, active X3) -> U14#(X1, X2, X3), U14#(active X1, X2, X3) -> U14#(X1, X2, X3))
     (U13#(active X1, X2, X3) -> U13#(X1, X2, X3), U13#(X1, X2, mark X3) -> U13#(X1, X2, X3))
     (U13#(active X1, X2, X3) -> U13#(X1, X2, X3), U13#(X1, X2, active X3) -> U13#(X1, X2, X3))
     (U13#(active X1, X2, X3) -> U13#(X1, X2, X3), U13#(X1, mark X2, X3) -> U13#(X1, X2, X3))
     (U13#(active X1, X2, X3) -> U13#(X1, X2, X3), U13#(X1, active X2, X3) -> U13#(X1, X2, X3))
     (U13#(active X1, X2, X3) -> U13#(X1, X2, X3), U13#(mark X1, X2, X3) -> U13#(X1, X2, X3))
     (U13#(active X1, X2, X3) -> U13#(X1, X2, X3), U13#(active X1, X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, active X2, X3) -> U13#(X1, X2, X3), U13#(X1, X2, mark X3) -> U13#(X1, X2, X3))
     (U13#(X1, active X2, X3) -> U13#(X1, X2, X3), U13#(X1, X2, active X3) -> U13#(X1, X2, X3))
     (U13#(X1, active X2, X3) -> U13#(X1, X2, X3), U13#(X1, mark X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, active X2, X3) -> U13#(X1, X2, X3), U13#(X1, active X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, active X2, X3) -> U13#(X1, X2, X3), U13#(mark X1, X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, active X2, X3) -> U13#(X1, X2, X3), U13#(active X1, X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, X2, active X3) -> U13#(X1, X2, X3), U13#(X1, X2, mark X3) -> U13#(X1, X2, X3))
     (U13#(X1, X2, active X3) -> U13#(X1, X2, X3), U13#(X1, X2, active X3) -> U13#(X1, X2, X3))
     (U13#(X1, X2, active X3) -> U13#(X1, X2, X3), U13#(X1, mark X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, X2, active X3) -> U13#(X1, X2, X3), U13#(X1, active X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, X2, active X3) -> U13#(X1, X2, X3), U13#(mark X1, X2, X3) -> U13#(X1, X2, X3))
     (U13#(X1, X2, active X3) -> U13#(X1, X2, X3), U13#(active X1, X2, X3) -> U13#(X1, X2, X3))
     (U11#(active X1, X2, X3) -> U11#(X1, X2, X3), U11#(X1, X2, mark X3) -> U11#(X1, X2, X3))
     (U11#(active X1, X2, X3) -> U11#(X1, X2, X3), U11#(X1, X2, active X3) -> U11#(X1, X2, X3))
     (U11#(active X1, X2, X3) -> U11#(X1, X2, X3), U11#(X1, mark X2, X3) -> U11#(X1, X2, X3))
     (U11#(active X1, X2, X3) -> U11#(X1, X2, X3), U11#(X1, active X2, X3) -> U11#(X1, X2, X3))
     (U11#(active X1, X2, X3) -> U11#(X1, X2, X3), U11#(mark X1, X2, X3) -> U11#(X1, X2, X3))
     (U11#(active X1, X2, X3) -> U11#(X1, X2, X3), U11#(active X1, X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, active X2, X3) -> U11#(X1, X2, X3), U11#(X1, X2, mark X3) -> U11#(X1, X2, X3))
     (U11#(X1, active X2, X3) -> U11#(X1, X2, X3), U11#(X1, X2, active X3) -> U11#(X1, X2, X3))
     (U11#(X1, active X2, X3) -> U11#(X1, X2, X3), U11#(X1, mark X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, active X2, X3) -> U11#(X1, X2, X3), U11#(X1, active X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, active X2, X3) -> U11#(X1, X2, X3), U11#(mark X1, X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, active X2, X3) -> U11#(X1, X2, X3), U11#(active X1, X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, X2, active X3) -> U11#(X1, X2, X3), U11#(X1, X2, mark X3) -> U11#(X1, X2, X3))
     (U11#(X1, X2, active X3) -> U11#(X1, X2, X3), U11#(X1, X2, active X3) -> U11#(X1, X2, X3))
     (U11#(X1, X2, active X3) -> U11#(X1, X2, X3), U11#(X1, mark X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, X2, active X3) -> U11#(X1, X2, X3), U11#(X1, active X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, X2, active X3) -> U11#(X1, X2, X3), U11#(mark X1, X2, X3) -> U11#(X1, X2, X3))
     (U11#(X1, X2, active X3) -> U11#(X1, X2, X3), U11#(active X1, X2, X3) -> U11#(X1, X2, X3))
     (U12#(active X1, X2, X3) -> U12#(X1, X2, X3), U12#(X1, X2, mark X3) -> U12#(X1, X2, X3))
     (U12#(active X1, X2, X3) -> U12#(X1, X2, X3), U12#(X1, X2, active X3) -> U12#(X1, X2, X3))
     (U12#(active X1, X2, X3) -> U12#(X1, X2, X3), U12#(X1, mark X2, X3) -> U12#(X1, X2, X3))
     (U12#(active X1, X2, X3) -> U12#(X1, X2, X3), U12#(X1, active X2, X3) -> U12#(X1, X2, X3))
     (U12#(active X1, X2, X3) -> U12#(X1, X2, X3), U12#(mark X1, X2, X3) -> U12#(X1, X2, X3))
     (U12#(active X1, X2, X3) -> U12#(X1, X2, X3), U12#(active X1, X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, active X2, X3) -> U12#(X1, X2, X3), U12#(X1, X2, mark X3) -> U12#(X1, X2, X3))
     (U12#(X1, active X2, X3) -> U12#(X1, X2, X3), U12#(X1, X2, active X3) -> U12#(X1, X2, X3))
     (U12#(X1, active X2, X3) -> U12#(X1, X2, X3), U12#(X1, mark X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, active X2, X3) -> U12#(X1, X2, X3), U12#(X1, active X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, active X2, X3) -> U12#(X1, X2, X3), U12#(mark X1, X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, active X2, X3) -> U12#(X1, X2, X3), U12#(active X1, X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, X2, active X3) -> U12#(X1, X2, X3), U12#(X1, X2, mark X3) -> U12#(X1, X2, X3))
     (U12#(X1, X2, active X3) -> U12#(X1, X2, X3), U12#(X1, X2, active X3) -> U12#(X1, X2, X3))
     (U12#(X1, X2, active X3) -> U12#(X1, X2, X3), U12#(X1, mark X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, X2, active X3) -> U12#(X1, X2, X3), U12#(X1, active X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, X2, active X3) -> U12#(X1, X2, X3), U12#(mark X1, X2, X3) -> U12#(X1, X2, X3))
     (U12#(X1, X2, active X3) -> U12#(X1, X2, X3), U12#(active X1, X2, X3) -> U12#(X1, X2, X3))
     (mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3), U64#(mark X1, X2, X3) -> U64#(X1, X2, X3))
     (mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3), U64#(active X1, X2, X3) -> U64#(X1, X2, X3))
     (mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3), U61#(mark X1, X2, X3) -> U61#(X1, X2, X3))
     (mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3), U61#(active X1, X2, X3) -> U61#(X1, X2, X3))
     (mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3), U14#(mark X1, X2, X3) -> U14#(X1, X2, X3))
     (mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3), U14#(active X1, X2, X3) -> U14#(X1, X2, X3))
     (mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3), U11#(mark X1, X2, X3) -> U11#(X1, X2, X3))
     (mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3), U11#(active X1, X2, X3) -> U11#(X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U12(X1, X2, X3) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# isNatKind X -> active# isNatKind X)
     (active# U52(tt(), N) -> mark# N, mark# U11(X1, X2, X3) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# tt() -> active# tt())
     (active# U52(tt(), N) -> mark# N, mark# U13(X1, X2, X3) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U14(X1, X2, X3) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U15(X1, X2) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# isNat X -> active# isNat X)
     (active# U52(tt(), N) -> mark# N, mark# U16 X -> mark# X)
     (active# U52(tt(), N) -> mark# N, mark# U16 X -> active# U16 mark X)
     (active# U52(tt(), N) -> mark# N, mark# U16 X -> U16# mark X)
     (active# U52(tt(), N) -> mark# N, mark# U22(X1, X2) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# U21(X1, X2) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# U23 X -> mark# X)
     (active# U52(tt(), N) -> mark# N, mark# U23 X -> active# U23 mark X)
     (active# U52(tt(), N) -> mark# N, mark# U23 X -> U23# mark X)
     (active# U52(tt(), N) -> mark# N, mark# U32 X -> mark# X)
     (active# U52(tt(), N) -> mark# N, mark# U32 X -> active# U32 mark X)
     (active# U52(tt(), N) -> mark# N, mark# U32 X -> U32# mark X)
     (active# U52(tt(), N) -> mark# N, mark# U31(X1, X2) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# U41 X -> mark# X)
     (active# U52(tt(), N) -> mark# N, mark# U41 X -> active# U41 mark X)
     (active# U52(tt(), N) -> mark# N, mark# U41 X -> U41# mark X)
     (active# U52(tt(), N) -> mark# N, mark# U52(X1, X2) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# U51(X1, X2) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U52(tt(), N) -> mark# N, mark# U62(X1, X2, X3) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U61(X1, X2, X3) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U63(X1, X2, X3) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U64(X1, X2, X3) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U52(tt(), N) -> mark# N, mark# s X -> mark# X)
     (active# U52(tt(), N) -> mark# N, mark# s X -> active# s mark X)
     (active# U52(tt(), N) -> mark# N, mark# s X -> s# mark X)
     (active# U52(tt(), N) -> mark# N, mark# plus(X1, X2) -> mark# X1)
     (active# U52(tt(), N) -> mark# N, mark# plus(X1, X2) -> mark# X2)
     (active# U52(tt(), N) -> mark# N, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U52(tt(), N) -> mark# N, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# U52(tt(), N) -> mark# N, mark# 0() -> active# 0())
     (active# U64(tt(), M, N) -> s# plus(N, M), s# mark X -> s# X)
     (active# U64(tt(), M, N) -> s# plus(N, M), s# active X -> s# X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U12(X1, X2, X3) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# isNatKind X -> active# isNatKind X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U11(X1, X2, X3) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U13(X1, X2, X3) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U14(X1, X2, X3) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U15(X1, X2) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# isNat X -> active# isNat X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U16 X -> mark# X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U16 X -> active# U16 mark X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U16 X -> U16# mark X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U22(X1, X2) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U21(X1, X2) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U23 X -> mark# X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U23 X -> active# U23 mark X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U23 X -> U23# mark X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U32 X -> mark# X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U32 X -> active# U32 mark X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U32 X -> U32# mark X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U31(X1, X2) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U41 X -> mark# X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U41 X -> active# U41 mark X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U41 X -> U41# mark X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U52(X1, X2) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U51(X1, X2) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U62(X1, X2, X3) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U61(X1, X2, X3) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U63(X1, X2, X3) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U64(X1, X2, X3) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# s X -> mark# X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# s X -> active# s mark X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# s X -> s# mark X)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# plus(X1, X2) -> mark# X1)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# plus(X1, X2) -> mark# X2)
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U12(X1, X2, X3) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# isNatKind X -> active# isNatKind X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U11(X1, X2, X3) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U13(X1, X2, X3) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U14(X1, X2, X3) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U15(X1, X2) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U15(X1, X2) -> U15#(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# isNat X -> active# isNat X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U16 X -> mark# X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U16 X -> active# U16 mark X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U16 X -> U16# mark X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U22(X1, X2) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U22(X1, X2) -> U22#(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U21(X1, X2) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U21(X1, X2) -> U21#(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U23 X -> mark# X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U23 X -> active# U23 mark X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U23 X -> U23# mark X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U32 X -> mark# X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U32 X -> active# U32 mark X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U32 X -> U32# mark X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U31(X1, X2) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U31(X1, X2) -> U31#(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U41 X -> mark# X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U41 X -> active# U41 mark X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U41 X -> U41# mark X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U52(X1, X2) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U52(X1, X2) -> U52#(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U51(X1, X2) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U51(X1, X2) -> U51#(mark X1, X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U62(X1, X2, X3) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U61(X1, X2, X3) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U63(X1, X2, X3) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U64(X1, X2, X3) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# s X -> mark# X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# s X -> active# s mark X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# s X -> s# mark X)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# plus(X1, X2) -> mark# X1)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# plus(X1, X2) -> mark# X2)
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2), mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNatKind 0() -> mark# tt())
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U15(tt(), V2) -> isNat# V2)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNat s V1 -> isNatKind# V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# isNat 0() -> mark# tt())
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U16 tt() -> mark# tt())
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U22(tt(), V1) -> isNat# V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U23 tt() -> mark# tt())
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U32 tt() -> mark# tt())
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U41 tt() -> mark# tt())
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U52(tt(), N) -> mark# N)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U51(tt(), N) -> isNatKind# N)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U62(tt(), M, N) -> isNat# N)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# plus(N, s M) -> isNat# M)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# plus(N, 0()) -> isNat# N)
     (mark# U51(X1, X2) -> active# U51(mark X1, X2), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNatKind 0() -> mark# tt())
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U15(tt(), V2) -> isNat# V2)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNat s V1 -> isNatKind# V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# isNat 0() -> mark# tt())
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U16 tt() -> mark# tt())
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U22(tt(), V1) -> isNat# V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U23 tt() -> mark# tt())
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U32 tt() -> mark# tt())
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U41 tt() -> mark# tt())
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U52(tt(), N) -> mark# N)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U51(tt(), N) -> isNatKind# N)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U62(tt(), M, N) -> isNat# N)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# plus(N, s M) -> isNat# M)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# plus(N, 0()) -> isNat# N)
     (mark# U31(X1, X2) -> active# U31(mark X1, X2), active# plus(N, 0()) -> U51#(isNat N, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U12(tt(), V1, V2) -> isNatKind# V2)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U12(tt(), V1, V2) -> U13#(isNatKind V2, V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNatKind s V1 -> mark# U41 isNatKind V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNatKind s V1 -> isNatKind# V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNatKind s V1 -> U41# isNatKind V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNatKind plus(V1, V2) -> isNatKind# V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNatKind 0() -> mark# tt())
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U11(tt(), V1, V2) -> U12#(isNatKind V1, V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U11(tt(), V1, V2) -> isNatKind# V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U13(tt(), V1, V2) -> isNatKind# V2)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U13(tt(), V1, V2) -> U14#(isNatKind V2, V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U14(tt(), V1, V2) -> U15#(isNat V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U14(tt(), V1, V2) -> isNat# V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U15(tt(), V2) -> mark# U16 isNat V2)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U15(tt(), V2) -> isNat# V2)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U15(tt(), V2) -> U16# isNat V2)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNat s V1 -> mark# U21(isNatKind V1, V1))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNat s V1 -> isNatKind# V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNat s V1 -> U21#(isNatKind V1, V1))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNat plus(V1, V2) -> isNatKind# V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNat plus(V1, V2) -> U11#(isNatKind V1, V1, V2))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# isNat 0() -> mark# tt())
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U16 tt() -> mark# tt())
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U22(tt(), V1) -> mark# U23 isNat V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U22(tt(), V1) -> isNat# V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U22(tt(), V1) -> U23# isNat V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U21(tt(), V1) -> isNatKind# V1)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U21(tt(), V1) -> U22#(isNatKind V1, V1))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U23 tt() -> mark# tt())
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U32 tt() -> mark# tt())
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U31(tt(), V2) -> mark# U32 isNatKind V2)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U31(tt(), V2) -> isNatKind# V2)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U31(tt(), V2) -> U32# isNatKind V2)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U41 tt() -> mark# tt())
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U52(tt(), N) -> mark# N)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U51(tt(), N) -> mark# U52(isNatKind N, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U51(tt(), N) -> isNatKind# N)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U51(tt(), N) -> U52#(isNatKind N, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U62(tt(), M, N) -> mark# U63(isNat N, M, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U62(tt(), M, N) -> isNat# N)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U62(tt(), M, N) -> U63#(isNat N, M, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U61(tt(), M, N) -> isNatKind# M)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U61(tt(), M, N) -> U62#(isNatKind M, M, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U63(tt(), M, N) -> isNatKind# N)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U63(tt(), M, N) -> U64#(isNatKind N, M, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U64(tt(), M, N) -> mark# s plus(N, M))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U64(tt(), M, N) -> s# plus(N, M))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# U64(tt(), M, N) -> plus#(N, M))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# plus(N, s M) -> mark# U61(isNat M, M, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# plus(N, s M) -> isNat# M)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# plus(N, s M) -> U61#(isNat M, M, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# plus(N, 0()) -> mark# U51(isNat N, N))
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# plus(N, 0()) -> isNat# N)
     (mark# U22(X1, X2) -> active# U22(mark X1, X2), active# plus(N, 0()) -> U51#(isNat N, N))
     (active# plus(N, 0()) -> U51#(isNat N, N), U51#(mark X1, X2) -> U51#(X1, X2))
     (active# plus(N, 0()) -> U51#(isNat N, N), U51#(active X1, X2) -> U51#(X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U12(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U12(X1, X2, X3) -> U12#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# isNatKind X -> active# isNatKind X)
     (mark# plus(X1, X2) -> mark# X2, mark# U11(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U11(X1, X2, X3) -> U11#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# tt() -> active# tt())
     (mark# plus(X1, X2) -> mark# X2, mark# U13(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U13(X1, X2, X3) -> U13#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U14(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U14(X1, X2, X3) -> U14#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U15(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U15(X1, X2) -> active# U15(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U15(X1, X2) -> U15#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# isNat X -> active# isNat X)
     (mark# plus(X1, X2) -> mark# X2, mark# U16 X -> mark# X)
     (mark# plus(X1, X2) -> mark# X2, mark# U16 X -> active# U16 mark X)
     (mark# plus(X1, X2) -> mark# X2, mark# U16 X -> U16# mark X)
     (mark# plus(X1, X2) -> mark# X2, mark# U22(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U22(X1, X2) -> active# U22(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U22(X1, X2) -> U22#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U21(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U21(X1, X2) -> active# U21(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U21(X1, X2) -> U21#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U23 X -> mark# X)
     (mark# plus(X1, X2) -> mark# X2, mark# U23 X -> active# U23 mark X)
     (mark# plus(X1, X2) -> mark# X2, mark# U23 X -> U23# mark X)
     (mark# plus(X1, X2) -> mark# X2, mark# U32 X -> mark# X)
     (mark# plus(X1, X2) -> mark# X2, mark# U32 X -> active# U32 mark X)
     (mark# plus(X1, X2) -> mark# X2, mark# U32 X -> U32# mark X)
     (mark# plus(X1, X2) -> mark# X2, mark# U31(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U31(X1, X2) -> active# U31(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U31(X1, X2) -> U31#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U41 X -> mark# X)
     (mark# plus(X1, X2) -> mark# X2, mark# U41 X -> active# U41 mark X)
     (mark# plus(X1, X2) -> mark# X2, mark# U41 X -> U41# mark X)
     (mark# plus(X1, X2) -> mark# X2, mark# U52(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U52(X1, X2) -> active# U52(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U52(X1, X2) -> U52#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U51(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U51(X1, X2) -> active# U51(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U51(X1, X2) -> U51#(mark X1, X2))
     (mark# plus(X1, X2) -> mark# X2, mark# U62(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U62(X1, X2, X3) -> U62#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U61(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U61(X1, X2, X3) -> U61#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U63(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U63(X1, X2, X3) -> U63#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U64(X1, X2, X3) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# U64(X1, X2, X3) -> U64#(mark X1, X2, X3))
     (mark# plus(X1, X2) -> mark# X2, mark# s X -> mark# X)
     (mark# plus(X1, X2) -> mark# X2, mark# s X -> active# s mark X)
     (mark# plus(X1, X2) -> mark# X2, mark# s X -> s# mark X)
     (mark# plus(X1, X2) -> mark# X2, mark# plus(X1, X2) -> mark# X1)
     (mark# plus(X1, X2) -> mark# X2, mark# plus(X1, X2) -> mark# X2)
     (mark# plus(X1, X2) -> mark# X2, mark# plus(X1, X2) -> active# plus(mark X1, mark X2))
     (mark# plus(X1, X2) -> mark# X2, mark# plus(X1, X2) -> plus#(mark X1, mark X2))
     (mark# plus(X1, X2) -> mark# X2, mark# 0() -> active# 0())
     (active# U32 tt() -> mark# tt(), mark# tt() -> active# tt())
     (active# U16 tt() -> mark# tt(), mark# tt() -> active# tt())
     (active# isNatKind 0() -> mark# tt(), mark# tt() -> active# tt())
     (active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2), U31#(mark X1, X2) -> U31#(X1, X2))
     (active# isNatKind plus(V1, V2) -> U31#(isNatKind V1, V2), U31#(active X1, X2) -> U31#(X1, X2))
    }
    STATUS:
     arrows: 0.905152
     SCCS (23):
      Scc:
       {  isNat# mark X -> isNat# X,
        isNat# active X -> isNat# X}
      Scc:
       {  isNatKind# mark X -> isNatKind# X,
        isNatKind# active X -> isNatKind# X}
      Scc:
       {         mark# U12(X1, X2, X3) -> mark# X1,
                 mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3),
                     mark# isNatKind X -> active# isNatKind X,
                 mark# U11(X1, X2, X3) -> mark# X1,
                 mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3),
                 mark# U13(X1, X2, X3) -> mark# X1,
                 mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3),
                 mark# U14(X1, X2, X3) -> mark# X1,
                 mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3),
                     mark# U15(X1, X2) -> mark# X1,
                     mark# U15(X1, X2) -> active# U15(mark X1, X2),
                         mark# isNat X -> active# isNat X,
                           mark# U16 X -> mark# X,
                           mark# U16 X -> active# U16 mark X,
                     mark# U22(X1, X2) -> mark# X1,
                     mark# U22(X1, X2) -> active# U22(mark X1, X2),
                     mark# U21(X1, X2) -> mark# X1,
                     mark# U21(X1, X2) -> active# U21(mark X1, X2),
                           mark# U23 X -> mark# X,
                           mark# U23 X -> active# U23 mark X,
                           mark# U32 X -> mark# X,
                           mark# U32 X -> active# U32 mark X,
                     mark# U31(X1, X2) -> mark# X1,
                     mark# U31(X1, X2) -> active# U31(mark X1, X2),
                           mark# U41 X -> mark# X,
                           mark# U41 X -> active# U41 mark X,
                     mark# U52(X1, X2) -> mark# X1,
                     mark# U52(X1, X2) -> active# U52(mark X1, X2),
                     mark# U51(X1, X2) -> mark# X1,
                     mark# U51(X1, X2) -> active# U51(mark X1, X2),
                 mark# U62(X1, X2, X3) -> mark# X1,
                 mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3),
                 mark# U61(X1, X2, X3) -> mark# X1,
                 mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3),
                 mark# U63(X1, X2, X3) -> mark# X1,
                 mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3),
                 mark# U64(X1, X2, X3) -> mark# X1,
                 mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3),
                             mark# s X -> mark# X,
                             mark# s X -> active# s mark X,
                    mark# plus(X1, X2) -> mark# X1,
                    mark# plus(X1, X2) -> mark# X2,
                    mark# plus(X1, X2) -> active# plus(mark X1, mark X2),
             active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2),
                active# isNatKind s V1 -> mark# U41 isNatKind V1,
        active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2),
             active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2),
             active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2),
             active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2),
                 active# U15(tt(), V2) -> mark# U16 isNat V2,
                    active# isNat s V1 -> mark# U21(isNatKind V1, V1),
            active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2),
                 active# U22(tt(), V1) -> mark# U23 isNat V1,
                 active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1),
                 active# U31(tt(), V2) -> mark# U32 isNatKind V2,
                  active# U52(tt(), N) -> mark# N,
                  active# U51(tt(), N) -> mark# U52(isNatKind N, N),
               active# U62(tt(), M, N) -> mark# U63(isNat N, M, N),
               active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N),
               active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N),
               active# U64(tt(), M, N) -> mark# s plus(N, M),
                  active# plus(N, s M) -> mark# U61(isNat M, M, N),
                  active# plus(N, 0()) -> mark# U51(isNat N, N)}
      Scc:
       {  plus#(X1, mark X2) -> plus#(X1, X2),
        plus#(X1, active X2) -> plus#(X1, X2),
          plus#(mark X1, X2) -> plus#(X1, X2),
        plus#(active X1, X2) -> plus#(X1, X2)}
      Scc:
       {  s# mark X -> s# X,
        s# active X -> s# X}
      Scc:
       {  U61#(X1, X2, mark X3) -> U61#(X1, X2, X3),
        U61#(X1, X2, active X3) -> U61#(X1, X2, X3),
          U61#(X1, mark X2, X3) -> U61#(X1, X2, X3),
        U61#(X1, active X2, X3) -> U61#(X1, X2, X3),
          U61#(mark X1, X2, X3) -> U61#(X1, X2, X3),
        U61#(active X1, X2, X3) -> U61#(X1, X2, X3)}
      Scc:
       {  U64#(X1, X2, mark X3) -> U64#(X1, X2, X3),
        U64#(X1, X2, active X3) -> U64#(X1, X2, X3),
          U64#(X1, mark X2, X3) -> U64#(X1, X2, X3),
        U64#(X1, active X2, X3) -> U64#(X1, X2, X3),
          U64#(mark X1, X2, X3) -> U64#(X1, X2, X3),
        U64#(active X1, X2, X3) -> U64#(X1, X2, X3)}
      Scc:
       {  U62#(X1, X2, mark X3) -> U62#(X1, X2, X3),
        U62#(X1, X2, active X3) -> U62#(X1, X2, X3),
          U62#(X1, mark X2, X3) -> U62#(X1, X2, X3),
        U62#(X1, active X2, X3) -> U62#(X1, X2, X3),
          U62#(mark X1, X2, X3) -> U62#(X1, X2, X3),
        U62#(active X1, X2, X3) -> U62#(X1, X2, X3)}
      Scc:
       {  U51#(X1, mark X2) -> U51#(X1, X2),
        U51#(X1, active X2) -> U51#(X1, X2),
          U51#(mark X1, X2) -> U51#(X1, X2),
        U51#(active X1, X2) -> U51#(X1, X2)}
      Scc:
       {  U63#(X1, X2, mark X3) -> U63#(X1, X2, X3),
        U63#(X1, X2, active X3) -> U63#(X1, X2, X3),
          U63#(X1, mark X2, X3) -> U63#(X1, X2, X3),
        U63#(X1, active X2, X3) -> U63#(X1, X2, X3),
          U63#(mark X1, X2, X3) -> U63#(X1, X2, X3),
        U63#(active X1, X2, X3) -> U63#(X1, X2, X3)}
      Scc:
       {  U52#(X1, mark X2) -> U52#(X1, X2),
        U52#(X1, active X2) -> U52#(X1, X2),
          U52#(mark X1, X2) -> U52#(X1, X2),
        U52#(active X1, X2) -> U52#(X1, X2)}
      Scc:
       {  U32# mark X -> U32# X,
        U32# active X -> U32# X}
      Scc:
       {  U23# mark X -> U23# X,
        U23# active X -> U23# X}
      Scc:
       {  U22#(X1, mark X2) -> U22#(X1, X2),
        U22#(X1, active X2) -> U22#(X1, X2),
          U22#(mark X1, X2) -> U22#(X1, X2),
        U22#(active X1, X2) -> U22#(X1, X2)}
      Scc:
       {  U21#(X1, mark X2) -> U21#(X1, X2),
        U21#(X1, active X2) -> U21#(X1, X2),
          U21#(mark X1, X2) -> U21#(X1, X2),
        U21#(active X1, X2) -> U21#(X1, X2)}
      Scc:
       {  U16# mark X -> U16# X,
        U16# active X -> U16# X}
      Scc:
       {  U14#(X1, X2, mark X3) -> U14#(X1, X2, X3),
        U14#(X1, X2, active X3) -> U14#(X1, X2, X3),
          U14#(X1, mark X2, X3) -> U14#(X1, X2, X3),
        U14#(X1, active X2, X3) -> U14#(X1, X2, X3),
          U14#(mark X1, X2, X3) -> U14#(X1, X2, X3),
        U14#(active X1, X2, X3) -> U14#(X1, X2, X3)}
      Scc:
       {  U11#(X1, X2, mark X3) -> U11#(X1, X2, X3),
        U11#(X1, X2, active X3) -> U11#(X1, X2, X3),
          U11#(X1, mark X2, X3) -> U11#(X1, X2, X3),
        U11#(X1, active X2, X3) -> U11#(X1, X2, X3),
          U11#(mark X1, X2, X3) -> U11#(X1, X2, X3),
        U11#(active X1, X2, X3) -> U11#(X1, X2, X3)}
      Scc:
       {  U41# mark X -> U41# X,
        U41# active X -> U41# X}
      Scc:
       {  U13#(X1, X2, mark X3) -> U13#(X1, X2, X3),
        U13#(X1, X2, active X3) -> U13#(X1, X2, X3),
          U13#(X1, mark X2, X3) -> U13#(X1, X2, X3),
        U13#(X1, active X2, X3) -> U13#(X1, X2, X3),
          U13#(mark X1, X2, X3) -> U13#(X1, X2, X3),
        U13#(active X1, X2, X3) -> U13#(X1, X2, X3)}
      Scc:
       {  U12#(X1, X2, mark X3) -> U12#(X1, X2, X3),
        U12#(X1, X2, active X3) -> U12#(X1, X2, X3),
          U12#(X1, mark X2, X3) -> U12#(X1, X2, X3),
        U12#(X1, active X2, X3) -> U12#(X1, X2, X3),
          U12#(mark X1, X2, X3) -> U12#(X1, X2, X3),
        U12#(active X1, X2, X3) -> U12#(X1, X2, X3)}
      Scc:
       {  U15#(X1, mark X2) -> U15#(X1, X2),
        U15#(X1, active X2) -> U15#(X1, X2),
          U15#(mark X1, X2) -> U15#(X1, X2),
        U15#(active X1, X2) -> U15#(X1, X2)}
      Scc:
       {  U31#(X1, mark X2) -> U31#(X1, X2),
        U31#(X1, active X2) -> U31#(X1, X2),
          U31#(mark X1, X2) -> U31#(X1, X2),
        U31#(active X1, X2) -> U31#(X1, X2)}
      
      SCC (2):
       Strict:
        {  isNat# mark X -> isNat# X,
         isNat# active X -> isNat# X}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      SCC (2):
       Strict:
        {  isNatKind# mark X -> isNatKind# X,
         isNatKind# active X -> isNatKind# X}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      SCC (63):
       Strict:
        {         mark# U12(X1, X2, X3) -> mark# X1,
                  mark# U12(X1, X2, X3) -> active# U12(mark X1, X2, X3),
                      mark# isNatKind X -> active# isNatKind X,
                  mark# U11(X1, X2, X3) -> mark# X1,
                  mark# U11(X1, X2, X3) -> active# U11(mark X1, X2, X3),
                  mark# U13(X1, X2, X3) -> mark# X1,
                  mark# U13(X1, X2, X3) -> active# U13(mark X1, X2, X3),
                  mark# U14(X1, X2, X3) -> mark# X1,
                  mark# U14(X1, X2, X3) -> active# U14(mark X1, X2, X3),
                      mark# U15(X1, X2) -> mark# X1,
                      mark# U15(X1, X2) -> active# U15(mark X1, X2),
                          mark# isNat X -> active# isNat X,
                            mark# U16 X -> mark# X,
                            mark# U16 X -> active# U16 mark X,
                      mark# U22(X1, X2) -> mark# X1,
                      mark# U22(X1, X2) -> active# U22(mark X1, X2),
                      mark# U21(X1, X2) -> mark# X1,
                      mark# U21(X1, X2) -> active# U21(mark X1, X2),
                            mark# U23 X -> mark# X,
                            mark# U23 X -> active# U23 mark X,
                            mark# U32 X -> mark# X,
                            mark# U32 X -> active# U32 mark X,
                      mark# U31(X1, X2) -> mark# X1,
                      mark# U31(X1, X2) -> active# U31(mark X1, X2),
                            mark# U41 X -> mark# X,
                            mark# U41 X -> active# U41 mark X,
                      mark# U52(X1, X2) -> mark# X1,
                      mark# U52(X1, X2) -> active# U52(mark X1, X2),
                      mark# U51(X1, X2) -> mark# X1,
                      mark# U51(X1, X2) -> active# U51(mark X1, X2),
                  mark# U62(X1, X2, X3) -> mark# X1,
                  mark# U62(X1, X2, X3) -> active# U62(mark X1, X2, X3),
                  mark# U61(X1, X2, X3) -> mark# X1,
                  mark# U61(X1, X2, X3) -> active# U61(mark X1, X2, X3),
                  mark# U63(X1, X2, X3) -> mark# X1,
                  mark# U63(X1, X2, X3) -> active# U63(mark X1, X2, X3),
                  mark# U64(X1, X2, X3) -> mark# X1,
                  mark# U64(X1, X2, X3) -> active# U64(mark X1, X2, X3),
                              mark# s X -> mark# X,
                              mark# s X -> active# s mark X,
                     mark# plus(X1, X2) -> mark# X1,
                     mark# plus(X1, X2) -> mark# X2,
                     mark# plus(X1, X2) -> active# plus(mark X1, mark X2),
              active# U12(tt(), V1, V2) -> mark# U13(isNatKind V2, V1, V2),
                 active# isNatKind s V1 -> mark# U41 isNatKind V1,
         active# isNatKind plus(V1, V2) -> mark# U31(isNatKind V1, V2),
              active# U11(tt(), V1, V2) -> mark# U12(isNatKind V1, V1, V2),
              active# U13(tt(), V1, V2) -> mark# U14(isNatKind V2, V1, V2),
              active# U14(tt(), V1, V2) -> mark# U15(isNat V1, V2),
                  active# U15(tt(), V2) -> mark# U16 isNat V2,
                     active# isNat s V1 -> mark# U21(isNatKind V1, V1),
             active# isNat plus(V1, V2) -> mark# U11(isNatKind V1, V1, V2),
                  active# U22(tt(), V1) -> mark# U23 isNat V1,
                  active# U21(tt(), V1) -> mark# U22(isNatKind V1, V1),
                  active# U31(tt(), V2) -> mark# U32 isNatKind V2,
                   active# U52(tt(), N) -> mark# N,
                   active# U51(tt(), N) -> mark# U52(isNatKind N, N),
                active# U62(tt(), M, N) -> mark# U63(isNat N, M, N),
                active# U61(tt(), M, N) -> mark# U62(isNatKind M, M, N),
                active# U63(tt(), M, N) -> mark# U64(isNatKind N, M, N),
                active# U64(tt(), M, N) -> mark# s plus(N, M),
                   active# plus(N, s M) -> mark# U61(isNat M, M, N),
                   active# plus(N, 0()) -> mark# U51(isNat N, N)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      SCC (4):
       Strict:
        {  plus#(X1, mark X2) -> plus#(X1, X2),
         plus#(X1, active X2) -> plus#(X1, X2),
           plus#(mark X1, X2) -> plus#(X1, X2),
         plus#(active X1, X2) -> plus#(X1, X2)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      
      
      
      
      
      
      
      SCC (2):
       Strict:
        {  s# mark X -> s# X,
         s# active X -> s# X}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      SCC (6):
       Strict:
        {  U61#(X1, X2, mark X3) -> U61#(X1, X2, X3),
         U61#(X1, X2, active X3) -> U61#(X1, X2, X3),
           U61#(X1, mark X2, X3) -> U61#(X1, X2, X3),
         U61#(X1, active X2, X3) -> U61#(X1, X2, X3),
           U61#(mark X1, X2, X3) -> U61#(X1, X2, X3),
         U61#(active X1, X2, X3) -> U61#(X1, X2, X3)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      SCC (6):
       Strict:
        {  U64#(X1, X2, mark X3) -> U64#(X1, X2, X3),
         U64#(X1, X2, active X3) -> U64#(X1, X2, X3),
           U64#(X1, mark X2, X3) -> U64#(X1, X2, X3),
         U64#(X1, active X2, X3) -> U64#(X1, X2, X3),
           U64#(mark X1, X2, X3) -> U64#(X1, X2, X3),
         U64#(active X1, X2, X3) -> U64#(X1, X2, X3)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      
      SCC (6):
       Strict:
        {  U62#(X1, X2, mark X3) -> U62#(X1, X2, X3),
         U62#(X1, X2, active X3) -> U62#(X1, X2, X3),
           U62#(X1, mark X2, X3) -> U62#(X1, X2, X3),
         U62#(X1, active X2, X3) -> U62#(X1, X2, X3),
           U62#(mark X1, X2, X3) -> U62#(X1, X2, X3),
         U62#(active X1, X2, X3) -> U62#(X1, X2, X3)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      SCC (4):
       Strict:
        {  U51#(X1, mark X2) -> U51#(X1, X2),
         U51#(X1, active X2) -> U51#(X1, X2),
           U51#(mark X1, X2) -> U51#(X1, X2),
         U51#(active X1, X2) -> U51#(X1, X2)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      SCC (6):
       Strict:
        {  U63#(X1, X2, mark X3) -> U63#(X1, X2, X3),
         U63#(X1, X2, active X3) -> U63#(X1, X2, X3),
           U63#(X1, mark X2, X3) -> U63#(X1, X2, X3),
         U63#(X1, active X2, X3) -> U63#(X1, X2, X3),
           U63#(mark X1, X2, X3) -> U63#(X1, X2, X3),
         U63#(active X1, X2, X3) -> U63#(X1, X2, X3)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      
      SCC (4):
       Strict:
        {  U52#(X1, mark X2) -> U52#(X1, X2),
         U52#(X1, active X2) -> U52#(X1, X2),
           U52#(mark X1, X2) -> U52#(X1, X2),
         U52#(active X1, X2) -> U52#(X1, X2)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      
      
      
      
      SCC (2):
       Strict:
        {  U32# mark X -> U32# X,
         U32# active X -> U32# X}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      
      
      SCC (2):
       Strict:
        {  U23# mark X -> U23# X,
         U23# active X -> U23# X}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      
      
      
      SCC (4):
       Strict:
        {  U22#(X1, mark X2) -> U22#(X1, X2),
         U22#(X1, active X2) -> U22#(X1, X2),
           U22#(mark X1, X2) -> U22#(X1, X2),
         U22#(active X1, X2) -> U22#(X1, X2)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      SCC (4):
       Strict:
        {  U21#(X1, mark X2) -> U21#(X1, X2),
         U21#(X1, active X2) -> U21#(X1, X2),
           U21#(mark X1, X2) -> U21#(X1, X2),
         U21#(active X1, X2) -> U21#(X1, X2)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      
      SCC (2):
       Strict:
        {  U16# mark X -> U16# X,
         U16# active X -> U16# X}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      
      
      
      
      SCC (6):
       Strict:
        {  U14#(X1, X2, mark X3) -> U14#(X1, X2, X3),
         U14#(X1, X2, active X3) -> U14#(X1, X2, X3),
           U14#(X1, mark X2, X3) -> U14#(X1, X2, X3),
         U14#(X1, active X2, X3) -> U14#(X1, X2, X3),
           U14#(mark X1, X2, X3) -> U14#(X1, X2, X3),
         U14#(active X1, X2, X3) -> U14#(X1, X2, X3)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      
      
      
      SCC (6):
       Strict:
        {  U11#(X1, X2, mark X3) -> U11#(X1, X2, X3),
         U11#(X1, X2, active X3) -> U11#(X1, X2, X3),
           U11#(X1, mark X2, X3) -> U11#(X1, X2, X3),
         U11#(X1, active X2, X3) -> U11#(X1, X2, X3),
           U11#(mark X1, X2, X3) -> U11#(X1, X2, X3),
         U11#(active X1, X2, X3) -> U11#(X1, X2, X3)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      SCC (2):
       Strict:
        {  U41# mark X -> U41# X,
         U41# active X -> U41# X}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      SCC (6):
       Strict:
        {  U13#(X1, X2, mark X3) -> U13#(X1, X2, X3),
         U13#(X1, X2, active X3) -> U13#(X1, X2, X3),
           U13#(X1, mark X2, X3) -> U13#(X1, X2, X3),
         U13#(X1, active X2, X3) -> U13#(X1, X2, X3),
           U13#(mark X1, X2, X3) -> U13#(X1, X2, X3),
         U13#(active X1, X2, X3) -> U13#(X1, X2, X3)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      SCC (6):
       Strict:
        {  U12#(X1, X2, mark X3) -> U12#(X1, X2, X3),
         U12#(X1, X2, active X3) -> U12#(X1, X2, X3),
           U12#(X1, mark X2, X3) -> U12#(X1, X2, X3),
         U12#(X1, active X2, X3) -> U12#(X1, X2, X3),
           U12#(mark X1, X2, X3) -> U12#(X1, X2, X3),
         U12#(active X1, X2, X3) -> U12#(X1, X2, X3)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      
      
      
      
      
      
      
      
      SCC (4):
       Strict:
        {  U15#(X1, mark X2) -> U15#(X1, X2),
         U15#(X1, active X2) -> U15#(X1, X2),
           U15#(mark X1, X2) -> U15#(X1, X2),
         U15#(active X1, X2) -> U15#(X1, X2)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open
      
      SCC (4):
       Strict:
        {  U31#(X1, mark X2) -> U31#(X1, X2),
         U31#(X1, active X2) -> U31#(X1, X2),
           U31#(mark X1, X2) -> U31#(X1, X2),
         U31#(active X1, X2) -> U31#(X1, X2)}
       Weak:
       {         mark U12(X1, X2, X3) -> active U12(mark X1, X2, X3),
                     mark isNatKind X -> active isNatKind X,
                 mark U11(X1, X2, X3) -> active U11(mark X1, X2, X3),
                            mark tt() -> active tt(),
                 mark U13(X1, X2, X3) -> active U13(mark X1, X2, X3),
                 mark U14(X1, X2, X3) -> active U14(mark X1, X2, X3),
                     mark U15(X1, X2) -> active U15(mark X1, X2),
                         mark isNat X -> active isNat X,
                           mark U16 X -> active U16 mark X,
                     mark U22(X1, X2) -> active U22(mark X1, X2),
                     mark U21(X1, X2) -> active U21(mark X1, X2),
                           mark U23 X -> active U23 mark X,
                           mark U32 X -> active U32 mark X,
                     mark U31(X1, X2) -> active U31(mark X1, X2),
                           mark U41 X -> active U41 mark X,
                     mark U52(X1, X2) -> active U52(mark X1, X2),
                     mark U51(X1, X2) -> active U51(mark X1, X2),
                 mark U62(X1, X2, X3) -> active U62(mark X1, X2, X3),
                 mark U61(X1, X2, X3) -> active U61(mark X1, X2, X3),
                 mark U63(X1, X2, X3) -> active U63(mark X1, X2, X3),
                 mark U64(X1, X2, X3) -> active U64(mark X1, X2, X3),
                             mark s X -> active s mark X,
                    mark plus(X1, X2) -> active plus(mark X1, mark X2),
                             mark 0() -> active 0(),
                 U12(X1, X2, mark X3) -> U12(X1, X2, X3),
               U12(X1, X2, active X3) -> U12(X1, X2, X3),
                 U12(X1, mark X2, X3) -> U12(X1, X2, X3),
               U12(X1, active X2, X3) -> U12(X1, X2, X3),
                 U12(mark X1, X2, X3) -> U12(X1, X2, X3),
               U12(active X1, X2, X3) -> U12(X1, X2, X3),
                     isNatKind mark X -> isNatKind X,
                   isNatKind active X -> isNatKind X,
             active U12(tt(), V1, V2) -> mark U13(isNatKind V2, V1, V2),
                active isNatKind s V1 -> mark U41 isNatKind V1,
        active isNatKind plus(V1, V2) -> mark U31(isNatKind V1, V2),
                 active isNatKind 0() -> mark tt(),
             active U11(tt(), V1, V2) -> mark U12(isNatKind V1, V1, V2),
             active U13(tt(), V1, V2) -> mark U14(isNatKind V2, V1, V2),
             active U14(tt(), V1, V2) -> mark U15(isNat V1, V2),
                 active U15(tt(), V2) -> mark U16 isNat V2,
                    active isNat s V1 -> mark U21(isNatKind V1, V1),
            active isNat plus(V1, V2) -> mark U11(isNatKind V1, V1, V2),
                     active isNat 0() -> mark tt(),
                      active U16 tt() -> mark tt(),
                 active U22(tt(), V1) -> mark U23 isNat V1,
                 active U21(tt(), V1) -> mark U22(isNatKind V1, V1),
                      active U23 tt() -> mark tt(),
                      active U32 tt() -> mark tt(),
                 active U31(tt(), V2) -> mark U32 isNatKind V2,
                      active U41 tt() -> mark tt(),
                  active U52(tt(), N) -> mark N,
                  active U51(tt(), N) -> mark U52(isNatKind N, N),
               active U62(tt(), M, N) -> mark U63(isNat N, M, N),
               active U61(tt(), M, N) -> mark U62(isNatKind M, M, N),
               active U63(tt(), M, N) -> mark U64(isNatKind N, M, N),
               active U64(tt(), M, N) -> mark s plus(N, M),
                  active plus(N, s M) -> mark U61(isNat M, M, N),
                  active plus(N, 0()) -> mark U51(isNat N, N),
                 U11(X1, X2, mark X3) -> U11(X1, X2, X3),
               U11(X1, X2, active X3) -> U11(X1, X2, X3),
                 U11(X1, mark X2, X3) -> U11(X1, X2, X3),
               U11(X1, active X2, X3) -> U11(X1, X2, X3),
                 U11(mark X1, X2, X3) -> U11(X1, X2, X3),
               U11(active X1, X2, X3) -> U11(X1, X2, X3),
                 U13(X1, X2, mark X3) -> U13(X1, X2, X3),
               U13(X1, X2, active X3) -> U13(X1, X2, X3),
                 U13(X1, mark X2, X3) -> U13(X1, X2, X3),
               U13(X1, active X2, X3) -> U13(X1, X2, X3),
                 U13(mark X1, X2, X3) -> U13(X1, X2, X3),
               U13(active X1, X2, X3) -> U13(X1, X2, X3),
                 U14(X1, X2, mark X3) -> U14(X1, X2, X3),
               U14(X1, X2, active X3) -> U14(X1, X2, X3),
                 U14(X1, mark X2, X3) -> U14(X1, X2, X3),
               U14(X1, active X2, X3) -> U14(X1, X2, X3),
                 U14(mark X1, X2, X3) -> U14(X1, X2, X3),
               U14(active X1, X2, X3) -> U14(X1, X2, X3),
                     U15(X1, mark X2) -> U15(X1, X2),
                   U15(X1, active X2) -> U15(X1, X2),
                     U15(mark X1, X2) -> U15(X1, X2),
                   U15(active X1, X2) -> U15(X1, X2),
                         isNat mark X -> isNat X,
                       isNat active X -> isNat X,
                           U16 mark X -> U16 X,
                         U16 active X -> U16 X,
                     U22(X1, mark X2) -> U22(X1, X2),
                   U22(X1, active X2) -> U22(X1, X2),
                     U22(mark X1, X2) -> U22(X1, X2),
                   U22(active X1, X2) -> U22(X1, X2),
                     U21(X1, mark X2) -> U21(X1, X2),
                   U21(X1, active X2) -> U21(X1, X2),
                     U21(mark X1, X2) -> U21(X1, X2),
                   U21(active X1, X2) -> U21(X1, X2),
                           U23 mark X -> U23 X,
                         U23 active X -> U23 X,
                           U32 mark X -> U32 X,
                         U32 active X -> U32 X,
                     U31(X1, mark X2) -> U31(X1, X2),
                   U31(X1, active X2) -> U31(X1, X2),
                     U31(mark X1, X2) -> U31(X1, X2),
                   U31(active X1, X2) -> U31(X1, X2),
                           U41 mark X -> U41 X,
                         U41 active X -> U41 X,
                     U52(X1, mark X2) -> U52(X1, X2),
                   U52(X1, active X2) -> U52(X1, X2),
                     U52(mark X1, X2) -> U52(X1, X2),
                   U52(active X1, X2) -> U52(X1, X2),
                     U51(X1, mark X2) -> U51(X1, X2),
                   U51(X1, active X2) -> U51(X1, X2),
                     U51(mark X1, X2) -> U51(X1, X2),
                   U51(active X1, X2) -> U51(X1, X2),
                 U62(X1, X2, mark X3) -> U62(X1, X2, X3),
               U62(X1, X2, active X3) -> U62(X1, X2, X3),
                 U62(X1, mark X2, X3) -> U62(X1, X2, X3),
               U62(X1, active X2, X3) -> U62(X1, X2, X3),
                 U62(mark X1, X2, X3) -> U62(X1, X2, X3),
               U62(active X1, X2, X3) -> U62(X1, X2, X3),
                 U61(X1, X2, mark X3) -> U61(X1, X2, X3),
               U61(X1, X2, active X3) -> U61(X1, X2, X3),
                 U61(X1, mark X2, X3) -> U61(X1, X2, X3),
               U61(X1, active X2, X3) -> U61(X1, X2, X3),
                 U61(mark X1, X2, X3) -> U61(X1, X2, X3),
               U61(active X1, X2, X3) -> U61(X1, X2, X3),
                 U63(X1, X2, mark X3) -> U63(X1, X2, X3),
               U63(X1, X2, active X3) -> U63(X1, X2, X3),
                 U63(X1, mark X2, X3) -> U63(X1, X2, X3),
               U63(X1, active X2, X3) -> U63(X1, X2, X3),
                 U63(mark X1, X2, X3) -> U63(X1, X2, X3),
               U63(active X1, X2, X3) -> U63(X1, X2, X3),
                 U64(X1, X2, mark X3) -> U64(X1, X2, X3),
               U64(X1, X2, active X3) -> U64(X1, X2, X3),
                 U64(X1, mark X2, X3) -> U64(X1, X2, X3),
               U64(X1, active X2, X3) -> U64(X1, X2, X3),
                 U64(mark X1, X2, X3) -> U64(X1, X2, X3),
               U64(active X1, X2, X3) -> U64(X1, X2, X3),
                             s mark X -> s X,
                           s active X -> s X,
                    plus(X1, mark X2) -> plus(X1, X2),
                  plus(X1, active X2) -> plus(X1, X2),
                    plus(mark X1, X2) -> plus(X1, X2),
                  plus(active X1, X2) -> plus(X1, X2)}
       Open