$$3ane4vaccen$$
$12v\left(eacn\right)^{2}$
$$3a^{2}ne\times 4vccen$$
$$3a^{2}n^{2}e\times 4vcce$$
$$3a^{2}n^{2}e^{2}\times 4vcc$$
$$3a^{2}n^{2}e^{2}\times 4vc^{2}$$
$$12a^{2}n^{2}e^{2}vc^{2}$$
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$12\left(eacn\right)^{2}$
