MAYBE
MAYBE
TRS:
 {
  f(ok(X1), ok(X2), ok(X3)) -> ok(f(X1, X2, X3)),
      active(f(X, g(X), Y)) -> mark(f(Y, Y, Y)),
               active(g(X)) -> g(active(X)),
             active(g(b())) -> mark(c()),
                active(b()) -> mark(c()),
                 g(mark(X)) -> mark(g(X)),
                   g(ok(X)) -> ok(g(X)),
      proper(f(X1, X2, X3)) -> f(proper(X1), proper(X2), proper(X3)),
               proper(g(X)) -> g(proper(X)),
                proper(c()) -> ok(c()),
                proper(b()) -> ok(b()),
               top(mark(X)) -> top(proper(X)),
                 top(ok(X)) -> top(active(X))
 }
 DUP: We consider a duplicating system.
  Trs:
   {
    f(ok(X1), ok(X2), ok(X3)) -> ok(f(X1, X2, X3)),
        active(f(X, g(X), Y)) -> mark(f(Y, Y, Y)),
                 active(g(X)) -> g(active(X)),
               active(g(b())) -> mark(c()),
                  active(b()) -> mark(c()),
                   g(mark(X)) -> mark(g(X)),
                     g(ok(X)) -> ok(g(X)),
        proper(f(X1, X2, X3)) -> f(proper(X1), proper(X2), proper(X3)),
                 proper(g(X)) -> g(proper(X)),
                  proper(c()) -> ok(c()),
                  proper(b()) -> ok(b()),
                 top(mark(X)) -> top(proper(X)),
                   top(ok(X)) -> top(active(X))
   }
  Fail