*                         *
                                *                         *
                               *                           *
                               *                  X      *
                              *                             *
                              *                    X       *
                              *                              *
                              *                     X      *
                              *                             *
                            *                                *
                           *                                 *
                           *                                 *
                          *                                  *
                         *                                    *
                          *                                    *
                           *                                    *
                            *                                     *
                            *                                     *
                            *                                     *
                            *                                      *
                          *                                         *
                         *                                           *
                        *                                             *
                       *                                              *
                     *                                                 *
                     *                                                  *
                     *                                                     *
                     *                                                      *
                     *                                                       *
                     *                                                        *
                     *                                                         *
                     *                                                          *
                     *                                                          *
                     *                                                           *
                     *                                                           *
                     *                                                            *