$$\frac { d 2 } { 81 / 2 }$$
$\frac{2}{81} = 0.024691358024691357$
$$\frac{2}{81}d_{2}^{1-1}$$
$$\frac{2}{81}d_{2}^{0}$$
$$\frac{2}{81}\times 1$$
$$\frac{2}{81}$$
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$\frac{2d_{2}}{81}$
$$\frac{d_{2}\times 2}{81}$$
