.                                *                                                    +                      .

               .                                        .                          .                                         .

 *                                .                                *                                +                              .

         .                                      .                                 .                                .                       +
 

                     +                            *              .                         .                             .                     .
 

      .                          .                .              .               *                           +                 .             .