$$2|1/2/9$$
$\frac{1}{9}\approx 0.111111111$
$$2|\frac{1}{2\times 9}|$$
$$2|\frac{1}{18}|$$
$$2\times \frac{1}{18}$$
$$\frac{2}{18}$$
$$\frac{1}{9}$$
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$\frac{1}{3 ^ {2}} = 0.1111111111111111$