.

                                       C
                              h      ha       h
                          a          ng           a
                         n            e               n
                        g           C     h            g
                        e           a      n            e
                        C           g      e            C
                         h           C    h            h
                          a           a   n           a
                            n            g            n
       ­                         g        e         g
                                   e     ●      e