(VAR X)
(RULES 
f(f(X)) -> c(n__f(g(n__f(X))))
c(X) -> d(activate(X))
h(X) -> c(n__d(X))
f(X) -> n__f(X)
d(X) -> n__d(X)
activate(n__f(X)) -> f(X)
activate(n__d(X)) -> d(X)
activate(X) -> X
)