TRS: { le(0(), y) -> true(), le(s(x), 0()) -> false(), le(s(x), s(y)) -> le(x, y), minus(x, 0()) -> x, minus(s(x), s(y)) -> minus(x, y), mod(0(), y) -> 0(), mod(s(x), 0()) -> 0(), mod(s(x), s(y)) -> if_mod(le(y, x), s(x), s(y)), if_mod(true(), x, y) -> mod(minus(x, y), y), if_mod(false(), s(x), s(y)) -> s(x)} Fail