TRS: { -(x, 0()) -> x, -(s(x), s(y)) -> -(x, y), +(0(), y) -> y, +(s(x), y) -> s(+(x, y)), *(x, 0()) -> 0(), *(x, s(y)) -> +(x, *(x, y)), f(s(x)) -> f(-(*(s(s(0())), s(x)), s(s(x))))} Fail