112111212X212112
1X21112121X1X212
X121112121X1XX12
XX2111212X212X12
2X21112121X1X112
212111212X212212
1121112121211112
X121112121211112
1X2111X12XX1X112
XX2111X12XX1X112
1X21X11121211112
1221112121X12112
