$$a^{18}+b^{15}$$
$\left(a^{6}+b^{5}\right)\left(a^{12}+b^{10}-b^{5}a^{6}\right)$
$$\left(a^{6}+b^{5}\right)\left(a^{12}+b^{10}-b^{5}a^{6}\right)$$
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$a^{18}+b^{15}$
