.
                                      S
                            k       ki       k
                         i           nn          i
                       n             y              n
                      n              S                n
                     y              k i                y
                    G             n   n               G
                    e              y    G               e
                     n             e    n              n
                      e             e   s              e
                        s              S               s
                           S           k           S
                              k        i         k
                                 i      n     i
                                     n n n
                                         Y