21X1X1211X2X1X11
21X1X1212XX21X11
21X1X1212XXX1211
21X1X1211XX21211
2121X1211XXX1X11
2121X1211X2X1X11
2121X1212X221211
2121X1211X221X11
2111X1211X22XX11
2111X121XX22XX11
2112X12X1X211211
21X1X12X2X2X1211
