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