XX12XX1111212121
XX122121X2X1X121
XX212X1122111121
X122X211211XX121
1XXX221121X12121
1XX22X211112X121
1X121211X21X2121
1X2XX2111X121121
11X2X111XX222121
11122X112XXX1121
2XX211112X11X121
2X2XX121X1112121
2X221X11X1X21121
21X2X21112X11121
2111XX11X212X121
212X2X111X21X121
