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X1X2X11X1XX21X12
X1XX111X1XX21X12
XX1XX11X12X21X12
X112111X12X21X12
XX22111X11X21X12
X12XX11X11X21X12
1XX2111X12X21X12
11XXX11X12X21X12
1X12X11X11X21X12
1X1X111X11X21X12
1112X11X11X21X12
111X111X11X21X12
1X2XX11X1XX21X12
1122111X1XX21X12
2XXXX11X11X21X12
21X2111X11X21X12
2X12111X1XX21X12
211XX11X1XX21X12
2X22X11X12X21X12
2X2X111X12X21X12
2122X11X12X21X12
212X111X12X21X12
