.
                                    C
                           o      oo         o
                        o          k             o
                       k           ie              k
                      i           C   o              i
                     e           o    k              e
                     C            i   e               C
                      o            C o               o
                       o            ok              o
                         k            i              k
                             i         e          i
                                 e    ~       e