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