.

                                    C
                            h      hé      h
                         é          ri         é
                       r            C             r
                      i              h               i
                     C              é                C
                     h            r     i             h
                     é            C     h            é
                      r            é    r             r
                       i             i  C             i
                        C            h             C
                          h          é            h
                             é        r         é
                               r       i       r
                                   i         i