$$\left. \begin{array} { l } { 63 : 7 - 3 \cdot 2 } \\ { + 4 } \end{array} \right.$$
$3,\ 4$
$$sort(9-3\times 2,4)$$
$$sort(9-6,4)$$
$$sort(3,4)$$
$$3,4$$
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