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X2 y2 1 dx 2xy dy 0
X2 y2 1 dx 2xy dy 0 pictures 5
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X2 y2 1 dx
X2 y2 1 dx 2xy dy 0
3 0 1 2xy x2 y2 dy dx 0
x2 y2 1 dx 2xy dy 0
