12XX11X1XXX21X12
12XXX1X1XX111X12
11XX2121XX2X1X12
X1XX1121XX211X12
X1XXX121XXXX1X12
X2XXX1X1XXXX1X12
X1XX2121XX121X12
21XX1121XX1X1X12
22XXX1X1XX221X12
22XX21X1XXX11X12
