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2X2X12X112112121
2111X22112112121
21X1X22112112121
X121X22112112121
2X211X1112112121
212X1X2112112121
2X21122212112121
212X12X212112121
21211X1212112121
2111122112X12121
21X1122112X12121
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2121X22112X12121
2X211221121X2121
212X1211121X2121
21211XX1121X2121
21211222121X2121
