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2111X2111X21XX12
21X11111X2221112
21X11211XX211X12
21X1X21112221X12
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21X1X1X11X211112
21X1X2X1XX22X112
2111112112211X12
21111121XX21X112
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2111X221XX221112
21X112211X221X12
21X112211221X112
21X1X121XX22XX12
21X1X221X2211X12
X1111X11X1211X12
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21111X11X1211X12
211X11211211XX12
