MAYBE
TRS:
 {                            from(X) -> cons(X, from(s(X))),
            2ndspos(s(N), cons(X, Z)) -> 2ndspos(s(N), cons2(X, Z)),
  2ndspos(s(N), cons2(X, cons(Y, Z))) -> rcons(posrecip(Y), 2ndsneg(N, Z)),
                      2ndspos(0(), Z) -> rnil(),
            2ndsneg(s(N), cons(X, Z)) -> 2ndsneg(s(N), cons2(X, Z)),
  2ndsneg(s(N), cons2(X, cons(Y, Z))) -> rcons(negrecip(Y), 2ndspos(N, Z)),
                      2ndsneg(0(), Z) -> rnil(),
                                pi(X) -> 2ndspos(X, from(0())),
                        plus(s(X), Y) -> s(plus(X, Y)),
                         plus(0(), Y) -> Y,
                       times(s(X), Y) -> plus(Y, times(X, Y)),
                        times(0(), Y) -> 0(),
                            square(X) -> times(X, X)}
 DP:
  Strict:
   {                            from#(X) -> from#(s(X)),
              2ndspos#(s(N), cons(X, Z)) -> 2ndspos#(s(N), cons2(X, Z)),
    2ndspos#(s(N), cons2(X, cons(Y, Z))) -> 2ndsneg#(N, Z),
              2ndsneg#(s(N), cons(X, Z)) -> 2ndsneg#(s(N), cons2(X, Z)),
    2ndsneg#(s(N), cons2(X, cons(Y, Z))) -> 2ndspos#(N, Z),
                                  pi#(X) -> from#(0()),
                                  pi#(X) -> 2ndspos#(X, from(0())),
                          plus#(s(X), Y) -> plus#(X, Y),
                         times#(s(X), Y) -> plus#(Y, times(X, Y)),
                         times#(s(X), Y) -> times#(X, Y),
                              square#(X) -> times#(X, X)}
  Weak:
  {                            from(X) -> cons(X, from(s(X))),
             2ndspos(s(N), cons(X, Z)) -> 2ndspos(s(N), cons2(X, Z)),
   2ndspos(s(N), cons2(X, cons(Y, Z))) -> rcons(posrecip(Y), 2ndsneg(N, Z)),
                       2ndspos(0(), Z) -> rnil(),
             2ndsneg(s(N), cons(X, Z)) -> 2ndsneg(s(N), cons2(X, Z)),
   2ndsneg(s(N), cons2(X, cons(Y, Z))) -> rcons(negrecip(Y), 2ndspos(N, Z)),
                       2ndsneg(0(), Z) -> rnil(),
                                 pi(X) -> 2ndspos(X, from(0())),
                         plus(s(X), Y) -> s(plus(X, Y)),
                          plus(0(), Y) -> Y,
                        times(s(X), Y) -> plus(Y, times(X, Y)),
                         times(0(), Y) -> 0(),
                             square(X) -> times(X, X)}
  EDG:
   {(2ndspos#(s(N), cons(X, Z)) -> 2ndspos#(s(N), cons2(X, Z)), 2ndspos#(s(N), cons2(X, cons(Y, Z))) -> 2ndsneg#(N, Z))
    (times#(s(X), Y) -> plus#(Y, times(X, Y)), plus#(s(X), Y) -> plus#(X, Y))
    (2ndspos#(s(N), cons2(X, cons(Y, Z))) -> 2ndsneg#(N, Z), 2ndsneg#(s(N), cons2(X, cons(Y, Z))) -> 2ndspos#(N, Z))
    (2ndspos#(s(N), cons2(X, cons(Y, Z))) -> 2ndsneg#(N, Z), 2ndsneg#(s(N), cons(X, Z)) -> 2ndsneg#(s(N), cons2(X, Z)))
    (pi#(X) -> from#(0()), from#(X) -> from#(s(X)))
    (times#(s(X), Y) -> times#(X, Y), times#(s(X), Y) -> times#(X, Y))
    (times#(s(X), Y) -> times#(X, Y), times#(s(X), Y) -> plus#(Y, times(X, Y)))
    (from#(X) -> from#(s(X)), from#(X) -> from#(s(X)))
    (plus#(s(X), Y) -> plus#(X, Y), plus#(s(X), Y) -> plus#(X, Y))
    (2ndsneg#(s(N), cons2(X, cons(Y, Z))) -> 2ndspos#(N, Z), 2ndspos#(s(N), cons(X, Z)) -> 2ndspos#(s(N), cons2(X, Z)))
    (2ndsneg#(s(N), cons2(X, cons(Y, Z))) -> 2ndspos#(N, Z), 2ndspos#(s(N), cons2(X, cons(Y, Z))) -> 2ndsneg#(N, Z))
    (pi#(X) -> 2ndspos#(X, from(0())), 2ndspos#(s(N), cons(X, Z)) -> 2ndspos#(s(N), cons2(X, Z)))
    (pi#(X) -> 2ndspos#(X, from(0())), 2ndspos#(s(N), cons2(X, cons(Y, Z))) -> 2ndsneg#(N, Z))
    (2ndsneg#(s(N), cons(X, Z)) -> 2ndsneg#(s(N), cons2(X, Z)), 2ndsneg#(s(N), cons2(X, cons(Y, Z))) -> 2ndspos#(N, Z))
    (square#(X) -> times#(X, X), times#(s(X), Y) -> plus#(Y, times(X, Y)))
    (square#(X) -> times#(X, X), times#(s(X), Y) -> times#(X, Y))}
   SCCS:
    Scc:
     {times#(s(X), Y) -> times#(X, Y)}
    Scc:
     {plus#(s(X), Y) -> plus#(X, Y)}
    Scc:
     {          2ndspos#(s(N), cons(X, Z)) -> 2ndspos#(s(N), cons2(X, Z)),
      2ndspos#(s(N), cons2(X, cons(Y, Z))) -> 2ndsneg#(N, Z),
                2ndsneg#(s(N), cons(X, Z)) -> 2ndsneg#(s(N), cons2(X, Z)),
      2ndsneg#(s(N), cons2(X, cons(Y, Z))) -> 2ndspos#(N, Z)}
    Scc:
     {from#(X) -> from#(s(X))}
    SCC:
     Strict:
      {times#(s(X), Y) -> times#(X, Y)}
     Weak:
     {                            from(X) -> cons(X, from(s(X))),
                2ndspos(s(N), cons(X, Z)) -> 2ndspos(s(N), cons2(X, Z)),
      2ndspos(s(N), cons2(X, cons(Y, Z))) -> rcons(posrecip(Y), 2ndsneg(N, Z)),
                          2ndspos(0(), Z) -> rnil(),
                2ndsneg(s(N), cons(X, Z)) -> 2ndsneg(s(N), cons2(X, Z)),
      2ndsneg(s(N), cons2(X, cons(Y, Z))) -> rcons(negrecip(Y), 2ndspos(N, Z)),
                          2ndsneg(0(), Z) -> rnil(),
                                    pi(X) -> 2ndspos(X, from(0())),
                            plus(s(X), Y) -> s(plus(X, Y)),
                             plus(0(), Y) -> Y,
                           times(s(X), Y) -> plus(Y, times(X, Y)),
                            times(0(), Y) -> 0(),
                                square(X) -> times(X, X)}
     SPSC:
      Simple Projection:
       pi(times#) = 0
      Strict:
       {}
      Qed
    SCC:
     Strict:
      {plus#(s(X), Y) -> plus#(X, Y)}
     Weak:
     {                            from(X) -> cons(X, from(s(X))),
                2ndspos(s(N), cons(X, Z)) -> 2ndspos(s(N), cons2(X, Z)),
      2ndspos(s(N), cons2(X, cons(Y, Z))) -> rcons(posrecip(Y), 2ndsneg(N, Z)),
                          2ndspos(0(), Z) -> rnil(),
                2ndsneg(s(N), cons(X, Z)) -> 2ndsneg(s(N), cons2(X, Z)),
      2ndsneg(s(N), cons2(X, cons(Y, Z))) -> rcons(negrecip(Y), 2ndspos(N, Z)),
                          2ndsneg(0(), Z) -> rnil(),
                                    pi(X) -> 2ndspos(X, from(0())),
                            plus(s(X), Y) -> s(plus(X, Y)),
                             plus(0(), Y) -> Y,
                           times(s(X), Y) -> plus(Y, times(X, Y)),
                            times(0(), Y) -> 0(),
                                square(X) -> times(X, X)}
     SPSC:
      Simple Projection:
       pi(plus#) = 0
      Strict:
       {}
      Qed
    SCC:
     Strict:
      {          2ndspos#(s(N), cons(X, Z)) -> 2ndspos#(s(N), cons2(X, Z)),
       2ndspos#(s(N), cons2(X, cons(Y, Z))) -> 2ndsneg#(N, Z),
                 2ndsneg#(s(N), cons(X, Z)) -> 2ndsneg#(s(N), cons2(X, Z)),
       2ndsneg#(s(N), cons2(X, cons(Y, Z))) -> 2ndspos#(N, Z)}
     Weak:
     {                            from(X) -> cons(X, from(s(X))),
                2ndspos(s(N), cons(X, Z)) -> 2ndspos(s(N), cons2(X, Z)),
      2ndspos(s(N), cons2(X, cons(Y, Z))) -> rcons(posrecip(Y), 2ndsneg(N, Z)),
                          2ndspos(0(), Z) -> rnil(),
                2ndsneg(s(N), cons(X, Z)) -> 2ndsneg(s(N), cons2(X, Z)),
      2ndsneg(s(N), cons2(X, cons(Y, Z))) -> rcons(negrecip(Y), 2ndspos(N, Z)),
                          2ndsneg(0(), Z) -> rnil(),
                                    pi(X) -> 2ndspos(X, from(0())),
                            plus(s(X), Y) -> s(plus(X, Y)),
                             plus(0(), Y) -> Y,
                           times(s(X), Y) -> plus(Y, times(X, Y)),
                            times(0(), Y) -> 0(),
                                square(X) -> times(X, X)}
     SPSC:
      Simple Projection:
       pi(2ndsneg#) = 0, pi(2ndspos#) = 0
      Strict:
       {          2ndspos#(s(N), cons(X, Z)) -> 2ndspos#(s(N), cons2(X, Z)),
        2ndspos#(s(N), cons2(X, cons(Y, Z))) -> 2ndsneg#(N, Z),
                  2ndsneg#(s(N), cons(X, Z)) -> 2ndsneg#(s(N), cons2(X, Z))}
      EDG:
       {(2ndspos#(s(N), cons2(X, cons(Y, Z))) -> 2ndsneg#(N, Z), 2ndsneg#(s(N), cons(X, Z)) -> 2ndsneg#(s(N), cons2(X, Z)))
        (2ndspos#(s(N), cons(X, Z)) -> 2ndspos#(s(N), cons2(X, Z)), 2ndspos#(s(N), cons2(X, cons(Y, Z))) -> 2ndsneg#(N, Z))}
       SCCS:
        
        Qed
    SCC:
     Strict:
      {from#(X) -> from#(s(X))}
     Weak:
     {                            from(X) -> cons(X, from(s(X))),
                2ndspos(s(N), cons(X, Z)) -> 2ndspos(s(N), cons2(X, Z)),
      2ndspos(s(N), cons2(X, cons(Y, Z))) -> rcons(posrecip(Y), 2ndsneg(N, Z)),
                          2ndspos(0(), Z) -> rnil(),
                2ndsneg(s(N), cons(X, Z)) -> 2ndsneg(s(N), cons2(X, Z)),
      2ndsneg(s(N), cons2(X, cons(Y, Z))) -> rcons(negrecip(Y), 2ndspos(N, Z)),
                          2ndsneg(0(), Z) -> rnil(),
                                    pi(X) -> 2ndspos(X, from(0())),
                            plus(s(X), Y) -> s(plus(X, Y)),
                             plus(0(), Y) -> Y,
                           times(s(X), Y) -> plus(Y, times(X, Y)),
                            times(0(), Y) -> 0(),
                                square(X) -> times(X, X)}
     Fail