$$\frac{ 7 }{ 278 \times 7777777777 }$$
$\frac{1}{308888888858}\approx 3.237410072 \cdot 10^{-12}$
$$\frac{7}{2162222222006}$$
$$\frac{1}{308888888858}$$
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$\frac{1}{2 \cdot 11 \cdot 41 \cdot 139 \cdot 271 \cdot 9091} = 3.2374100722661874 \times 10^{-12}$
