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X 2 2xy 2y 2
X 2 2xy 2y 2 pictures 5
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X 2
X 2 2xy 2y 2
x 2 2xy 2y 2 4
x 2 2xy 2y 2 2x 4y 1
x^2 - 2xy + 2y^2
x 2 2xy 2y 2 2x 3y 3
x 2 2xy 2y 2 4y 5
x^2+2xy+2y^2u003d0
x 2 2xy 2y 2 2x 2
x 2 2xy 2y 2 2x 10y 17
x 2 2xy 2y 2 2y 1
x 2 2xy 2y 2 2y 1 0
x^2-2xy+2y^2u003d4
x^2+2xy+2y^2+2x+4y+1
x 2 2xy 2y 2
