$\left(-8a^4+3y^2\right)^2$
$d+d+d$
$\left(4x^2-2x\right)\left(3+6x\right)$
$x^2+2xy+x^2$
$\left(ab^3-2\right)\cdot\left(ab^3+2\right)$
$\left(x^{a-3}-7\right)^2$
$3x^23$
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