MAYBE
MAYBE
TRS:
 {
       mark(f(X)) -> active(f(X)),
       mark(g(X)) -> active(g(X)),
        mark(c()) -> active(c()),
       f(mark(X)) -> f(X),
     f(active(X)) -> f(X),
       g(mark(X)) -> g(X),
     g(active(X)) -> g(X),
  active(f(g(X))) -> mark(g(X)),
      active(c()) -> mark(f(g(c())))
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
         mark(f(X)) -> active(f(X)),
         mark(g(X)) -> active(g(X)),
          mark(c()) -> active(c()),
         f(mark(X)) -> f(X),
       f(active(X)) -> f(X),
         g(mark(X)) -> g(X),
       g(active(X)) -> g(X),
    active(f(g(X))) -> mark(g(X)),
        active(c()) -> mark(f(g(c())))
   }
  Fail