$$(x+xb+_{2}\times8-$$
$\frac{1}{28}\approx 0.035714286$
$$\frac{2}{7\times 8}$$
$$\frac{2}{56}$$
$$\frac{1}{28}$$
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$\frac{1}{2 ^ {2} \cdot 7} = 0.03571428571428571$
