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