$u^2-1$
$1-\left(-3\right)+\left[4-\left(1-3\right)\right]$
$2-\left(-\left(7-2\right)+1\right)-4$
$623+147$
$4\cdot2^{10}$
$\left(x+4\:\right)^2$
$\left(-u^4w^9x\right)^2$
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