TIMEOUT
MAYBE
Trs:
 {  if(false(), X, Y) -> activate(Y),
     if(true(), X, Y) -> X,
                 f(X) -> if(X, c(), n__f(n__true())),
                 f(X) -> n__f(X),
               true() -> n__true(),
    activate(n__f(X)) -> f(activate(X)),
  activate(n__true()) -> true(),
          activate(X) -> X}
 Open