$s^{-4}\cdot s^2$
$j^4-17j^2+16$
$2^{5^0}$
$3\:\le8+x$
$-5x+7+4x-3$
$\left(x\:+\:2\:y\right)^2$
$\left(4m^3+3n^4\right)\left(4m^3-3n^4\right)$
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