$4-7-13-16-2$
$\left(x+y\right)x\left(x^{2}-xy+y^{2}\right)$
$8x+8y+cx+cy$
$2\left(2x+1\right)^2+1$
$m^2+12m+20$
$\left(m+n-1\right)\left(m^2\:+\:1\right)-m^2\:-1\:$
$\left(8+2m^2\right)\cdot\left(6+2m^2\right)$
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