TIMEOUT
MAYBE
Trs:
 {        f(f(a())) -> c(n__f(n__g(n__f(n__a())))),
               f(X) -> n__f(X),
               g(X) -> n__g(X),
                a() -> n__a(),
  activate(n__f(X)) -> f(activate(X)),
  activate(n__g(X)) -> g(activate(X)),
   activate(n__a()) -> a(),
        activate(X) -> X}
 Open