$$\frac { 1 } { 27 } \times 3 ^ { - 3 }$$
$\frac{1}{729}\approx 0.001371742$
$$\frac{1}{27}\times \frac{1}{27}$$
$$\frac{1}{729}$$
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$\frac{1}{3 ^ {6}} = 0.0013717421124828531$
