YES
(VAR x y)
(RULES
f(f(x,0()),0()) -> x
s(s(x)) -> x
f(0(),x) -> x
f(s(x),y) -> s(f(x,y))
g(0(),x) -> x
g(s(x),y) -> f(g(x,y),0())
h(0()) -> s(0())
)