XX                    X     X                                        X      X                                         X             X      X             X      X      X      X      X      X      X      X      X      X      X      X      X      X
X      X      X      X      X      X      X      X      X      X      X      X      X      X      X      X      X
XX                    X     X                                        X      X                                         X             X      X             X      X      X      X      X      X      X      X      X      X      X      X      X      X X      X      X      X      X      X      X      X      X      X      X      X      X      X      X      X