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X square k 4 x k 1 2 0
X square k 4 x k 1 2 0 pictures 5
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X square k 4
X square k 4 x k 1 2 0
k square x square 2 x 2 k 1 into x 4 0
4 x square 2 k 1 close x k 4 0
if x square k 4 x k 1 2 0
x square k 4 x k 1 2 0
