5m Zen
X square k 4
X square k 4 pictures 5
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X square
X square k 4
x square 4 kx k 0
4 x square 2 x k 4
x square 4 kx k
k 4 x square k 1 x 1
x square 4 x k 0
if x square k 4 x k 1
x square k 4 x k 1 2
