TIMEOUT
MAYBE
Trs:
 {        p(s(0())) -> 0(),
          f(s(0())) -> f(p(s(0()))),
             f(0()) -> cons(0(), n__f(n__s(n__0()))),
               f(X) -> n__f(X),
               s(X) -> n__s(X),
                0() -> n__0(),
  activate(n__f(X)) -> f(activate(X)),
  activate(n__s(X)) -> s(activate(X)),
   activate(n__0()) -> 0(),
        activate(X) -> X}
 Open