$$4 { \left(x+y \right) }^{ 2 } -2x-2y$$
$2\left(x+y\right)\left(2x+2y-1\right)$
$$4\left(x^{2}+2xy+y^{2}\right)-2x-2y$$
$$4x^{2}+8xy+4y^{2}-2x-2y$$
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$4x^{2}+8xy-2x+4y^{2}-2y$
