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