$2\left(-1\right)^3\left(-1\right)-2+3\:\left(-2\right)-\left(-3\right)^2$
$\left(z^6-4h\right)^2$
$\left(-9x-1\right)^2$
$\left(-12\right)^{-10\:}\left(-12\right)^{-10}$
$\left(-2+\frac{x^2}{4}\right)^2$
$2^3\:.3^2\:\:\:3^3\:\:$
$25x^2-81z^2$
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