$$8x^{4}+108x^{2}y^{2}+162y^{4}$$
$2\left(4x^{4}+54x^{2}y^{2}+81y^{4}\right)$
$$2\left(4x^{4}+54x^{2}y^{2}+81y^{4}\right)$$
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$8x^{4}+162y^{4}+108\left(xy\right)^{2}$
