$$a b ^ { 2 } + 2 a ^ { 2 } b + a ^ { 3 } 2 a b ^ { 2 } - 4 a ^ { 2 } b - 6 a ^ { 3 }$$
$a\left(b^{2}+2b^{2}a^{3}-2ab-6a^{2}\right)$
$$a\left(b^{2}+2ab+2a^{2}ab^{2}-4ab-6a^{2}\right)$$
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