.
                              
                                     me
                            m     me     m
                        e           me           e
                      m             m              m
                     e                e                  e
                    m               m                 m
                    e             e       m             e
                    m            e      m            m
                     e              e    m             e
                        m            m             m
                            e          e           e
                                m    m     m
                                        e