.
                                   H
                         o      o m      o
                       m       e H         m
                      e          om            e
                     H            e              H
                      o         H    o          o
                      m       m    e         m
                        e        H   o         e
                          H      m e       H
                            o       H       o
                              m    o    m
                                  e m e
                                      e