$$(-2mn) \times \frac{ 1 }{ 6 } { m }^{ 2 } { n }^{ 2 } \times 13 { m }^{ 4 } { n }^{ 4 }$$
$-\frac{13\left(mn\right)^{7}}{3}$
$$-2m^{3}n\times \frac{1}{6}n^{2}\times 13m^{4}n^{4}$$
$$-2m^{7}n\times \frac{1}{6}n^{2}\times 13n^{4}$$
$$-2m^{7}n^{3}\times \frac{1}{6}\times 13n^{4}$$
$$-2m^{7}n^{7}\times \frac{1}{6}\times 13$$
$$-\frac{1}{3}m^{7}n^{7}\times 13$$
$$-\frac{13}{3}m^{7}n^{7}$$
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$-\frac{91m^{6}n^{7}}{3}$
