$$2/156) \frac{ 156 }{ 2 \div \frac{ 156 }{ 2 \times 156 } } (2/156$$
$\frac{1}{78}\approx 0.012820513$
$$\frac{1}{78}$$
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$\frac{1}{2 \cdot 3 \cdot 13} = 0.01282051282051282$