X1X21111221X1XM1
X11211122X21X1M1
X11222212X1111M1
1X12211122XX11M1
1X2111212211XXM1
111X11XX22XX11M1
1111X1X2211X1XM1
112XX1X12X11X1M1
121X1121XX1111M1
1212111X2112XXM1
