X11211XX21XX2X12
211211XX21XX2X12
X1X211XX21XX2X12
21X211XX21XX2X12
X112X1XX21XX2X12
2112X1XX21XX2X12
X1X2X1XX21XX2X12
21X2X1XX21XX2X12
X112112X21XX2X12
2112112X21XX2X12
X1X2112X21XX2X12
21X2112X21XX2X12
X112X12X21XX2X12
2112X12X21XX2X12
X1X2X12X21XX2X12
21X2X12X21XX2X12
