Input TRS:
    1: |2ndspos|(s(N),cons(X)) -> |2ndspos|(s(N),cons2(Z))
    2: |2ndspos|(s(N),cons2(cons(Y))) -> rcons(posrecip(Y),|2ndsneg|(N,Z))
    3: |2ndsneg|(s(N),cons(X)) -> |2ndsneg|(s(N),cons2(Z))
    4: |2ndsneg|(s(N),cons2(cons(Y))) -> rcons(negrecip(Y),|2ndspos|(N,Z))
    5: from(X) -> cons(X)
    6: |2ndspos|(|0|(),Z) -> rnil()
    7: |2ndsneg|(|0|(),Z) -> rnil()
    8: pi(X) -> |2ndspos|(X,from(|0|()))
    9: plus(|0|(),Y) -> Y
    10: plus(s(X),Y) -> s(plus(X,Y))
    11: times(|0|(),Y) -> |0|()
    12: times(s(X),Y) -> plus(Y,times(X,Y))
    13: square(X) -> times(X,X)
Extra variable in rule 2.
NO