(xy-2z square)square
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(xy-2z^2)^2
(xy)^2-2 (xy)(2z^2)+(2z^2)^2
=x^2y^2-2xyz^2+4z^4
(xy)^2-2 (xy)(2z^2)+(2z^2)^2
=x^2y^2-2xyz^2+4z^4
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