.

                                      n
                             o     o  w     o
                          w       y  o         w
                         y            u             y
                       o              s                o
                      u               e                u
                      s             e    i               s
                       e            t    n              e
                        e     ­       o  w             e
                         i             y o             i
                          t             u              t
                            n           d          n
                               o        o       o
                                  w    n'   w
                                          t