$${ \left( \frac{ 6 }{ \frac{ 7 }{ \frac{ { 6 }^{ 2 } }{ 7 } } } \right) }^{ 2 }$$
$\frac{46656}{2401}\approx 19.431903374$
$$\left(\frac{6\times \frac{6^{2}}{7}}{7}\right)^{2}$$
$$\left(\frac{6\times \frac{36}{7}}{7}\right)^{2}$$
$$\left(\frac{\frac{216}{7}}{7}\right)^{2}$$
$$\left(\frac{216}{7\times 7}\right)^{2}$$
$$\left(\frac{216}{49}\right)^{2}$$
$$\frac{46656}{2401}$$
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$\frac{2 ^ {6} \cdot 3 ^ {6}}{7 ^ {4}} = 19\frac{1037}{2401} = 19.431903373594334$
