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