211121X1X12X1X21
2111212XX1211X21
2X1121XXX1211221
2X1121XXX12XXX21
2X1121XX212XXX21
2X112121X121XX21
2X112121X12X1221
21X121XX1121XX21
21X121XX112X1221
21X1212111211221
21X12121112XXX21
2XX12121112XXX21
2XX121X1112XX221
2XX1212X1121X221
212121X12121X221
2121212X212XX221
2X2121X121211X21
2X21212X212X1X21
