.

                                     S
                           t       t  a       t
                        a         b  i          a
                       b           l  i            b
                      i              z                i
                     l               e                 l
                     i               d                 i
                      z             C                 z
                       e          u   n             e
                         d        t     S           d
                          C        t    a         C
                            u      b   i        u
                               n    l   i      n
                                  t    z     t
                                        e
                                        d