X1X2X21X11211112
2X12X2X11X211112
111122X112X11X12
1X11X12X11211X12
2X1XXX1111X12X12
X11XX211XX212X12
XX1X12211XX11212
1112XX1XX1211212
21XX21111X211212
1X12X21X1X112212
111XX2XX11X12212
X111XXX112212212
