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Z y2. (X-Y)(X+Y). Z^2=XY. Z=X+2y+XY-X^2-Y^2. X2+XY+ZX+X+Y+Z.
(X-Y)(X+Y). Z^2=XY. Z=X+2y+XY-X^2-Y^2. X2+XY+ZX+X+Y+Z.

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