TRS: { minus(x, 0()) -> x, minus(s(x), s(y)) -> minus(x, y), double(0()) -> 0(), double(s(x)) -> s(s(double(x))), plus(0(), y) -> y, plus(s(x), y) -> s(plus(x, y)), plus(s(x), y) -> plus(x, s(y)), plus(s(x), y) -> s(plus(minus(x, y), double(y)))} Fail