$$( 2 a - b ) ( 2 b - a )$$
$-2a^{2}+5ab-2b^{2}$
$$4ab-2a^{2}-2b^{2}+ba$$
$$5ab-2a^{2}-2b^{2}$$
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$\left(2a-b\right)\left(2b-a\right)$
