$$\left. \begin{array} { l } { 40 + 28 + 2 } \\ { + 56 + 4 } \end{array} \right.$$
$60,70$
$$sort(68+2,56+4)$$
$$sort(70,56+4)$$
$$sort(70,60)$$
$$70$$
$$60,70$$
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$70,\ 60$
