MAYBE
MAYBE
TRS:
 {
     f(mark(X1), X2) -> mark(f(X1, X2)),
   f(ok(X1), ok(X2)) -> ok(f(X1, X2)),
          g(mark(X)) -> mark(g(X)),
            g(ok(X)) -> ok(g(X)),
   active(f(X1, X2)) -> f(active(X1), X2),
  active(f(g(X), Y)) -> mark(f(X, f(g(X), Y))),
        active(g(X)) -> g(active(X)),
   proper(f(X1, X2)) -> f(proper(X1), proper(X2)),
        proper(g(X)) -> g(proper(X)),
        top(mark(X)) -> top(proper(X)),
          top(ok(X)) -> top(active(X))
 }
 DUP: We consider a duplicating system.
  Trs:
   {
       f(mark(X1), X2) -> mark(f(X1, X2)),
     f(ok(X1), ok(X2)) -> ok(f(X1, X2)),
            g(mark(X)) -> mark(g(X)),
              g(ok(X)) -> ok(g(X)),
     active(f(X1, X2)) -> f(active(X1), X2),
    active(f(g(X), Y)) -> mark(f(X, f(g(X), Y))),
          active(g(X)) -> g(active(X)),
     proper(f(X1, X2)) -> f(proper(X1), proper(X2)),
          proper(g(X)) -> g(proper(X)),
          top(mark(X)) -> top(proper(X)),
            top(ok(X)) -> top(active(X))
   }
  Fail