$$1/128 \div 1/128 \div 1/128$$
$\frac{1}{2097152}\approx 0.000000477$
$$\frac{\frac{\frac{\frac{1}{128}}{1}}{128}}{128}$$
$$\frac{\frac{\frac{1}{128}}{128}}{128}$$
$$\frac{\frac{1}{128\times 128}}{128}$$
$$\frac{\frac{1}{16384}}{128}$$
$$\frac{1}{16384\times 128}$$
$$\frac{1}{2097152}$$
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$\frac{1}{2 ^ {21}} = 4.76837158203125 \times 10^{-7}$