$16z^2-72z+81$
$a^4+2a^2-24$
$-36-\left(4\cdot1\cdot16+2\cdot1\cdot9\right)$
$2x^2.3x^2y^2.5x^2y$
$2y^3x^6+12y^3x^3+18y^3$
$2a+6b^2$
$121m^2+44+4$
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