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1212111XX1122221
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21X2111122112X21
22112X1X11112221
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21X21111X2X22X21
X11121X122122221
2X112X1X22112221
X2X21X1111X12221
211211X11X12XX21
1X112111X12X2221
X2X12111XX122121
2X12111X1211X221
111122X1X1X12221
211X1X111122X221
