21X11X1X21111X11
21X11X12211XXX11
21X11X122211X111
21X1121X2211XX11
21X1121X221X1111
21X11212211X1X11
21X11212211XX111
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21XX1X1X22111111
21XX1X12221X1X11
21XX121X2111XX11
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21XX121221111111
21XX12122211XX11
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21X1X212221XXX11
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