$$\left. \begin{array} { l } { ( - 12 + 16 - 42 + 3 7 ) - 2 , - 3 - 4 } \\ \end{array} \right.$$
$-7,-3$
$$sort(4-42+37-2,-3-4)$$
$$sort(-38+37-2,-3-4)$$
$$sort(-1-2,-3-4)$$
$$sort(-3,-3-4)$$
$$sort(-3,-7)$$
$$-3$$
$$-7,-3$$
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$-3,\ -7$