$u^4-v^4$
$-4-7-1$
$\left(\sqrt{5}+\sqrt{2}\right)\left(\sqrt{5}-\sqrt{2}\right)+\left(\sqrt{7}-3\right)\left(\sqrt{7}+3\right)$
$2-8-4+3-5+2$
$9a^2+12ab^3$
$5x+3x-9$
$-4-1+8$
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