MAYBE
* Step 1: Failure MAYBE
  + Considered Problem:
      - Strict TRS:
          U11(mark(X1),X2) -> mark(U11(X1,X2))
          U11(ok(X1),ok(X2)) -> ok(U11(X1,X2))
          U12(mark(X1),X2) -> mark(U12(X1,X2))
          U12(ok(X1),ok(X2)) -> ok(U12(X1,X2))
          U13(mark(X)) -> mark(U13(X))
          U13(ok(X)) -> ok(U13(X))
          U21(mark(X1),X2,X3) -> mark(U21(X1,X2,X3))
          U21(ok(X1),ok(X2),ok(X3)) -> ok(U21(X1,X2,X3))
          U22(mark(X1),X2,X3) -> mark(U22(X1,X2,X3))
          U22(ok(X1),ok(X2),ok(X3)) -> ok(U22(X1,X2,X3))
          U23(mark(X1),X2,X3) -> mark(U23(X1,X2,X3))
          U23(ok(X1),ok(X2),ok(X3)) -> ok(U23(X1,X2,X3))
          U24(mark(X1),X2,X3) -> mark(U24(X1,X2,X3))
          U24(ok(X1),ok(X2),ok(X3)) -> ok(U24(X1,X2,X3))
          U25(mark(X1),X2) -> mark(U25(X1,X2))
          U25(ok(X1),ok(X2)) -> ok(U25(X1,X2))
          U26(mark(X)) -> mark(U26(X))
          U26(ok(X)) -> ok(U26(X))
          U31(mark(X1),X2) -> mark(U31(X1,X2))
          U31(ok(X1),ok(X2)) -> ok(U31(X1,X2))
          U32(mark(X1),X2) -> mark(U32(X1,X2))
          U32(ok(X1),ok(X2)) -> ok(U32(X1,X2))
          U33(mark(X)) -> mark(U33(X))
          U33(ok(X)) -> ok(U33(X))
          U41(mark(X1),X2,X3) -> mark(U41(X1,X2,X3))
          U41(ok(X1),ok(X2),ok(X3)) -> ok(U41(X1,X2,X3))
          U42(mark(X1),X2,X3) -> mark(U42(X1,X2,X3))
          U42(ok(X1),ok(X2),ok(X3)) -> ok(U42(X1,X2,X3))
          U43(mark(X1),X2,X3) -> mark(U43(X1,X2,X3))
          U43(ok(X1),ok(X2),ok(X3)) -> ok(U43(X1,X2,X3))
          U44(mark(X1),X2,X3) -> mark(U44(X1,X2,X3))
          U44(ok(X1),ok(X2),ok(X3)) -> ok(U44(X1,X2,X3))
          U45(mark(X1),X2) -> mark(U45(X1,X2))
          U45(ok(X1),ok(X2)) -> ok(U45(X1,X2))
          U46(mark(X)) -> mark(U46(X))
          U46(ok(X)) -> ok(U46(X))
          U51(mark(X1),X2,X3) -> mark(U51(X1,X2,X3))
          U51(ok(X1),ok(X2),ok(X3)) -> ok(U51(X1,X2,X3))
          U52(mark(X1),X2,X3) -> mark(U52(X1,X2,X3))
          U52(ok(X1),ok(X2),ok(X3)) -> ok(U52(X1,X2,X3))
          U53(mark(X1),X2,X3) -> mark(U53(X1,X2,X3))
          U53(ok(X1),ok(X2),ok(X3)) -> ok(U53(X1,X2,X3))
          U54(mark(X1),X2,X3) -> mark(U54(X1,X2,X3))
          U54(ok(X1),ok(X2),ok(X3)) -> ok(U54(X1,X2,X3))
          U55(mark(X1),X2) -> mark(U55(X1,X2))
          U55(ok(X1),ok(X2)) -> ok(U55(X1,X2))
          U56(mark(X)) -> mark(U56(X))
          U56(ok(X)) -> ok(U56(X))
          U61(mark(X1),X2) -> mark(U61(X1,X2))
          U61(ok(X1),ok(X2)) -> ok(U61(X1,X2))
          U62(mark(X1),X2) -> mark(U62(X1,X2))
          U62(ok(X1),ok(X2)) -> ok(U62(X1,X2))
          U63(mark(X)) -> mark(U63(X))
          U63(ok(X)) -> ok(U63(X))
          U71(mark(X1),X2,X3) -> mark(U71(X1,X2,X3))
          U71(ok(X1),ok(X2),ok(X3)) -> ok(U71(X1,X2,X3))
          U72(mark(X1),X2) -> mark(U72(X1,X2))
          U72(ok(X1),ok(X2)) -> ok(U72(X1,X2))
          U73(mark(X1),X2) -> mark(U73(X1,X2))
          U73(ok(X1),ok(X2)) -> ok(U73(X1,X2))
          U74(mark(X)) -> mark(U74(X))
          U74(ok(X)) -> ok(U74(X))
          U81(mark(X1),X2) -> mark(U81(X1,X2))
          U81(ok(X1),ok(X2)) -> ok(U81(X1,X2))
          U82(mark(X1),X2) -> mark(U82(X1,X2))
          U82(ok(X1),ok(X2)) -> ok(U82(X1,X2))
          U83(mark(X)) -> mark(U83(X))
          U83(ok(X)) -> ok(U83(X))
          U91(mark(X1),X2) -> mark(U91(X1,X2))
          U91(ok(X1),ok(X2)) -> ok(U91(X1,X2))
          U92(mark(X)) -> mark(U92(X))
          U92(ok(X)) -> ok(U92(X))
          __(X1,mark(X2)) -> mark(__(X1,X2))
          __(mark(X1),X2) -> mark(__(X1,X2))
          __(ok(X1),ok(X2)) -> ok(__(X1,X2))
          active(U11(X1,X2)) -> U11(active(X1),X2)
          active(U11(tt(),V)) -> mark(U12(isPalListKind(V),V))
          active(U12(X1,X2)) -> U12(active(X1),X2)
          active(U12(tt(),V)) -> mark(U13(isNeList(V)))
          active(U13(X)) -> U13(active(X))
          active(U13(tt())) -> mark(tt())
          active(U21(X1,X2,X3)) -> U21(active(X1),X2,X3)
          active(U21(tt(),V1,V2)) -> mark(U22(isPalListKind(V1),V1,V2))
          active(U22(X1,X2,X3)) -> U22(active(X1),X2,X3)
          active(U22(tt(),V1,V2)) -> mark(U23(isPalListKind(V2),V1,V2))
          active(U23(X1,X2,X3)) -> U23(active(X1),X2,X3)
          active(U23(tt(),V1,V2)) -> mark(U24(isPalListKind(V2),V1,V2))
          active(U24(X1,X2,X3)) -> U24(active(X1),X2,X3)
          active(U24(tt(),V1,V2)) -> mark(U25(isList(V1),V2))
          active(U25(X1,X2)) -> U25(active(X1),X2)
          active(U25(tt(),V2)) -> mark(U26(isList(V2)))
          active(U26(X)) -> U26(active(X))
          active(U26(tt())) -> mark(tt())
          active(U31(X1,X2)) -> U31(active(X1),X2)
          active(U31(tt(),V)) -> mark(U32(isPalListKind(V),V))
          active(U32(X1,X2)) -> U32(active(X1),X2)
          active(U32(tt(),V)) -> mark(U33(isQid(V)))
          active(U33(X)) -> U33(active(X))
          active(U33(tt())) -> mark(tt())
          active(U41(X1,X2,X3)) -> U41(active(X1),X2,X3)
          active(U41(tt(),V1,V2)) -> mark(U42(isPalListKind(V1),V1,V2))
          active(U42(X1,X2,X3)) -> U42(active(X1),X2,X3)
          active(U42(tt(),V1,V2)) -> mark(U43(isPalListKind(V2),V1,V2))
          active(U43(X1,X2,X3)) -> U43(active(X1),X2,X3)
          active(U43(tt(),V1,V2)) -> mark(U44(isPalListKind(V2),V1,V2))
          active(U44(X1,X2,X3)) -> U44(active(X1),X2,X3)
          active(U44(tt(),V1,V2)) -> mark(U45(isList(V1),V2))
          active(U45(X1,X2)) -> U45(active(X1),X2)
          active(U45(tt(),V2)) -> mark(U46(isNeList(V2)))
          active(U46(X)) -> U46(active(X))
          active(U46(tt())) -> mark(tt())
          active(U51(X1,X2,X3)) -> U51(active(X1),X2,X3)
          active(U51(tt(),V1,V2)) -> mark(U52(isPalListKind(V1),V1,V2))
          active(U52(X1,X2,X3)) -> U52(active(X1),X2,X3)
          active(U52(tt(),V1,V2)) -> mark(U53(isPalListKind(V2),V1,V2))
          active(U53(X1,X2,X3)) -> U53(active(X1),X2,X3)
          active(U53(tt(),V1,V2)) -> mark(U54(isPalListKind(V2),V1,V2))
          active(U54(X1,X2,X3)) -> U54(active(X1),X2,X3)
          active(U54(tt(),V1,V2)) -> mark(U55(isNeList(V1),V2))
          active(U55(X1,X2)) -> U55(active(X1),X2)
          active(U55(tt(),V2)) -> mark(U56(isList(V2)))
          active(U56(X)) -> U56(active(X))
          active(U56(tt())) -> mark(tt())
          active(U61(X1,X2)) -> U61(active(X1),X2)
          active(U61(tt(),V)) -> mark(U62(isPalListKind(V),V))
          active(U62(X1,X2)) -> U62(active(X1),X2)
          active(U62(tt(),V)) -> mark(U63(isQid(V)))
          active(U63(X)) -> U63(active(X))
          active(U63(tt())) -> mark(tt())
          active(U71(X1,X2,X3)) -> U71(active(X1),X2,X3)
          active(U71(tt(),I,P)) -> mark(U72(isPalListKind(I),P))
          active(U72(X1,X2)) -> U72(active(X1),X2)
          active(U72(tt(),P)) -> mark(U73(isPal(P),P))
          active(U73(X1,X2)) -> U73(active(X1),X2)
          active(U73(tt(),P)) -> mark(U74(isPalListKind(P)))
          active(U74(X)) -> U74(active(X))
          active(U74(tt())) -> mark(tt())
          active(U81(X1,X2)) -> U81(active(X1),X2)
          active(U81(tt(),V)) -> mark(U82(isPalListKind(V),V))
          active(U82(X1,X2)) -> U82(active(X1),X2)
          active(U82(tt(),V)) -> mark(U83(isNePal(V)))
          active(U83(X)) -> U83(active(X))
          active(U83(tt())) -> mark(tt())
          active(U91(X1,X2)) -> U91(active(X1),X2)
          active(U91(tt(),V2)) -> mark(U92(isPalListKind(V2)))
          active(U92(X)) -> U92(active(X))
          active(U92(tt())) -> mark(tt())
          active(__(X,nil())) -> mark(X)
          active(__(X1,X2)) -> __(X1,active(X2))
          active(__(X1,X2)) -> __(active(X1),X2)
          active(__(__(X,Y),Z)) -> mark(__(X,__(Y,Z)))
          active(__(nil(),X)) -> mark(X)
          active(isList(V)) -> mark(U11(isPalListKind(V),V))
          active(isList(__(V1,V2))) -> mark(U21(isPalListKind(V1),V1,V2))
          active(isList(nil())) -> mark(tt())
          active(isNeList(V)) -> mark(U31(isPalListKind(V),V))
          active(isNeList(__(V1,V2))) -> mark(U41(isPalListKind(V1),V1,V2))
          active(isNeList(__(V1,V2))) -> mark(U51(isPalListKind(V1),V1,V2))
          active(isNePal(V)) -> mark(U61(isPalListKind(V),V))
          active(isNePal(__(I,__(P,I)))) -> mark(U71(isQid(I),I,P))
          active(isPal(V)) -> mark(U81(isPalListKind(V),V))
          active(isPal(nil())) -> mark(tt())
          active(isPalListKind(__(V1,V2))) -> mark(U91(isPalListKind(V1),V2))
          active(isPalListKind(a())) -> mark(tt())
          active(isPalListKind(e())) -> mark(tt())
          active(isPalListKind(i())) -> mark(tt())
          active(isPalListKind(nil())) -> mark(tt())
          active(isPalListKind(o())) -> mark(tt())
          active(isPalListKind(u())) -> mark(tt())
          active(isQid(a())) -> mark(tt())
          active(isQid(e())) -> mark(tt())
          active(isQid(i())) -> mark(tt())
          active(isQid(o())) -> mark(tt())
          active(isQid(u())) -> mark(tt())
          isList(ok(X)) -> ok(isList(X))
          isNeList(ok(X)) -> ok(isNeList(X))
          isNePal(ok(X)) -> ok(isNePal(X))
          isPal(ok(X)) -> ok(isPal(X))
          isPalListKind(ok(X)) -> ok(isPalListKind(X))
          isQid(ok(X)) -> ok(isQid(X))
          proper(U11(X1,X2)) -> U11(proper(X1),proper(X2))
          proper(U12(X1,X2)) -> U12(proper(X1),proper(X2))
          proper(U13(X)) -> U13(proper(X))
          proper(U21(X1,X2,X3)) -> U21(proper(X1),proper(X2),proper(X3))
          proper(U22(X1,X2,X3)) -> U22(proper(X1),proper(X2),proper(X3))
          proper(U23(X1,X2,X3)) -> U23(proper(X1),proper(X2),proper(X3))
          proper(U24(X1,X2,X3)) -> U24(proper(X1),proper(X2),proper(X3))
          proper(U25(X1,X2)) -> U25(proper(X1),proper(X2))
          proper(U26(X)) -> U26(proper(X))
          proper(U31(X1,X2)) -> U31(proper(X1),proper(X2))
          proper(U32(X1,X2)) -> U32(proper(X1),proper(X2))
          proper(U33(X)) -> U33(proper(X))
          proper(U41(X1,X2,X3)) -> U41(proper(X1),proper(X2),proper(X3))
          proper(U42(X1,X2,X3)) -> U42(proper(X1),proper(X2),proper(X3))
          proper(U43(X1,X2,X3)) -> U43(proper(X1),proper(X2),proper(X3))
          proper(U44(X1,X2,X3)) -> U44(proper(X1),proper(X2),proper(X3))
          proper(U45(X1,X2)) -> U45(proper(X1),proper(X2))
          proper(U46(X)) -> U46(proper(X))
          proper(U51(X1,X2,X3)) -> U51(proper(X1),proper(X2),proper(X3))
          proper(U52(X1,X2,X3)) -> U52(proper(X1),proper(X2),proper(X3))
          proper(U53(X1,X2,X3)) -> U53(proper(X1),proper(X2),proper(X3))
          proper(U54(X1,X2,X3)) -> U54(proper(X1),proper(X2),proper(X3))
          proper(U55(X1,X2)) -> U55(proper(X1),proper(X2))
          proper(U56(X)) -> U56(proper(X))
          proper(U61(X1,X2)) -> U61(proper(X1),proper(X2))
          proper(U62(X1,X2)) -> U62(proper(X1),proper(X2))
          proper(U63(X)) -> U63(proper(X))
          proper(U71(X1,X2,X3)) -> U71(proper(X1),proper(X2),proper(X3))
          proper(U72(X1,X2)) -> U72(proper(X1),proper(X2))
          proper(U73(X1,X2)) -> U73(proper(X1),proper(X2))
          proper(U74(X)) -> U74(proper(X))
          proper(U81(X1,X2)) -> U81(proper(X1),proper(X2))
          proper(U82(X1,X2)) -> U82(proper(X1),proper(X2))
          proper(U83(X)) -> U83(proper(X))
          proper(U91(X1,X2)) -> U91(proper(X1),proper(X2))
          proper(U92(X)) -> U92(proper(X))
          proper(__(X1,X2)) -> __(proper(X1),proper(X2))
          proper(a()) -> ok(a())
          proper(e()) -> ok(e())
          proper(i()) -> ok(i())
          proper(isList(X)) -> isList(proper(X))
          proper(isNeList(X)) -> isNeList(proper(X))
          proper(isNePal(X)) -> isNePal(proper(X))
          proper(isPal(X)) -> isPal(proper(X))
          proper(isPalListKind(X)) -> isPalListKind(proper(X))
          proper(isQid(X)) -> isQid(proper(X))
          proper(nil()) -> ok(nil())
          proper(o()) -> ok(o())
          proper(tt()) -> ok(tt())
          proper(u()) -> ok(u())
          top(mark(X)) -> top(proper(X))
          top(ok(X)) -> top(active(X))
      - Signature:
          {U11/2,U12/2,U13/1,U21/3,U22/3,U23/3,U24/3,U25/2,U26/1,U31/2,U32/2,U33/1,U41/3,U42/3,U43/3,U44/3,U45/2,U46/1
          ,U51/3,U52/3,U53/3,U54/3,U55/2,U56/1,U61/2,U62/2,U63/1,U71/3,U72/2,U73/2,U74/1,U81/2,U82/2,U83/1,U91/2,U92/1
          ,__/2,active/1,isList/1,isNeList/1,isNePal/1,isPal/1,isPalListKind/1,isQid/1,proper/1,top/1} / {a/0,e/0,i/0
          ,mark/1,nil/0,o/0,ok/1,tt/0,u/0}
      - Obligation:
          innermost runtime complexity wrt. defined symbols {U11,U12,U13,U21,U22,U23,U24,U25,U26,U31,U32,U33,U41,U42
          ,U43,U44,U45,U46,U51,U52,U53,U54,U55,U56,U61,U62,U63,U71,U72,U73,U74,U81,U82,U83,U91,U92,__,active,isList
          ,isNeList,isNePal,isPal,isPalListKind,isQid,proper,top} and constructors {a,e,i,mark,nil,o,ok,tt,u}
  + Applied Processor:
      MI {miKind = Automaton Nothing, miDimension = 3, miUArgs = NoUArgs, miURules = NoURules, miSelector = Nothing}
  + Details:
      Incompatible
MAYBE