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