$$\frac{7^{-3}}{4^{2}}$$
$\frac{1}{5488}\approx 0.000182216$
$$\frac{\frac{1}{343}}{4^{2}}$$
$$\frac{\frac{1}{343}}{16}$$
$$\frac{1}{343\times 16}$$
$$\frac{1}{5488}$$
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$\frac{1}{2 ^ {4} \cdot 7 ^ {3}} = 0.00018221574344023323$
