.
                                      C
                            o       oc       o
                          c          a-          c
                        a            C             a
                         -            o               -
                      C            l   a              C
                      o           C    o              o
                       l           c    a              l
                        a             -               a
                         C          C o            C
                            o        la           o
                               l       C        l
                                    a o a
                                       k
                                       e