.

                                       G
                             r       e e        r
                          e          n G           e
                         e             r               e
                        n              e                n
                        G            e   n             G
                        r            G    r              r
                        e            e    e              e
                         e            n  G             e
                           n           r e            n
                             G           e           G
                                r         e         r
                                   e      n      e
                                           E
                                           N