$$8a^{3}b+4ab^{3}-2a^{2}b^{3}ab^{2}-a^{2}b^{3}+4ab^{3}$$
$ab\left(8b^{2}-ab^{2}+8a^{2}-2a^{2}b^{4}\right)$
$$ab\left(8a^{2}+4b^{2}-2ab^{2}ab^{2}-ab^{2}+4b^{2}\right)$$
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