(VAR x ) (RULES c -> f(c) c -> h(c) f(x) -> f(f(x)) h(x) -> h(h(x)) h(c) -> f(c) h(h(c)) -> f(c) f(c) -> h(h(c)) h(f(c)) -> f(c) h(h(c)) -> f(f(c)) f(h(c)) -> h(h(c)) f(f(c)) -> h(h(c)) h(f(f(c))) -> f(c) )