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X 2 4xy x
X 2 4xy x pictures 5
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X 2
X 2 4xy x
x 2 4xy x 4y 5
x 2 4xy 5y 2 2 x y
x 2 4xy y 2 x 2y
4xy )( x 2 x 1
x 2 4xy 4y 2 x 2y
x 3 2x 2 x 4xy 2
x 2 4xy x 3y 2 3y
x 2 4xy x
