$${ 2 }^{ 2 } / { 7 }^{ 2 } { 7 }^{ 2 } { 8 }^{ 2 }$$
$256$
$$\frac{4}{7^{2}}\times 7^{2}\times 8^{2}$$
$$\frac{4}{49}\times 7^{2}\times 8^{2}$$
$$\frac{4}{49}\times 49\times 8^{2}$$
$$4\times 8^{2}$$
$$4\times 64$$
$$256$$
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$2^{8}$
