$$8 \times 9 - [ 32 - \{ 24 \div ( 8 - 4 - 2 ) \} ]$$
$52$
$$72-\left(32-\frac{24}{8-4-2}\right)$$
$$72-\left(32-\frac{24}{4-2}\right)$$
$$72-\left(32-\frac{24}{2}\right)$$
$$72-\left(32-12\right)$$
$$72-20$$
$$52$$
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$2^{2}\times 13$
