.

                                     B
                             l      e  s      l
                          e        s  i          e
                        s            n              s
                       s             g                s
                       i              s                 i
                      n           B    l              n
                       g          e      s             g
                       s            s    i              s
                        s             n               s
                         i             g              i
                          n           s           n
                             g        B        g
                                 s     l     s
                                        e
                                        s
                                        s