TRS: {2nd(cons1(X, cons(Y, Z))) -> Y, 2nd(cons(X, X1)) -> 2nd(cons1(X, activate(X1))), from(X) -> cons(X, n__from(s(X))), from(X) -> n__from(X), activate(n__from(X)) -> from(X), activate(X) -> X} Fail