$\left(m^2-m^4\right)^2$
$4xyz-8yxz+zyx$
$\frac{81x^2-16m^2}{9x+4m}$
$7xy\:-\:5x^2$
$x^3+7x^2+16x+12$
$-4x^2-28x-49$
$\left(5x^2y^2+2x^5\right)$
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