21X12XX112112121
21X12X2X121X2121
2X2X22X112112121
2X2X222X121X2121
2X212X2112112121
2X212XXX121X2121
21XX222112112121
21XX22XX121X2121
2XXX2XXX12112121
2XXX2X21121X2121
212122XX12112121
21212221121X2121
2XX122X1121X2121
2XX1222X12112121
212X2XX1121X2121
212X2X2X12112121
