$$\left. \begin{array} { l } { ( - 6 ) + ( 3 ) + ( 2 ) } \\ { ( - 19 ) + 16 + 25 + ( - 31 ) } \end{array} \right.$$
$-9,-1$
$$sort(-3+2,-19+16+25-31)$$
$$sort(-1,-19+16+25-31)$$
$$sort(-1,-3+25-31)$$
$$sort(-1,22-31)$$
$$sort(-1,-9)$$
$$-1$$
$$-9,-1$$
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$-1,\ -9$