WGWGWGWGWGWGWGWGWGWGWGWGWG
WGXR                    WG
WG                      WG
WG                      WG
WG                    ZGWG
WG                      WG
WG                      WG
WG                      WG
WG                      WG
WG                      WG
WG                      WG
WG                    ZBWG
WGWGWGWGWGWGWGWGWGWGWGWGWG