$$[ ( \frac { - 1 } { 4 } ) ^ { - 3 } ] ^ { 4 } \rightarrow ( \frac { 3 } { 7 } ) ^ { ( - 3 ) \times 4 }$$
$16777216$
$$\left(\left(-\frac{1}{4}\right)^{-3}\right)^{4}$$
$$\left(-\frac{1}{4}\right)^{-3\times 4}$$
$$\left(-\frac{1}{4}\right)^{-12}$$
$$16777216$$
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$2^{24}$