$$16 { x }^{ 6a } -4a { y }^{ 2b }$$
$4\left(4\left(x^{a}\right)^{6}-a\left(y^{b}\right)^{2}\right)$
$$4\left(4x^{6a}-ay^{2b}\right)$$
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$16x^{6a}-4ay^{2b}$
