$18\cdot19$
$\left(x^4-x^3\right)$
$\sqrt{x}\left(x-\frac{1}{x}\right)$
$3\:x\:2h\:x\:5^2$
$14x^2-3x-2$
$4m^3n^3\cdot5m^6n^3$
$6^6\cdot6^6$
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