5m Zen
X2 2xy 2y2 2y 1
X2 2xy 2y2 2y 1 pictures 5
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X2 2xy 2y2
X2 2xy 2y2 2y 1
x2 2xy 2y2 2x 2y 1 0
x2 2xy 2y2 2y 1
