$$\left. \begin{array} { l } { + ( - 1 ) + 8 } \\ { ( - 13 ) + 17 + 21 } \end{array} \right.$$
$7,\ 25$
$$sort(7,-13+17+21)$$
$$sort(7,4+21)$$
$$sort(7,25)$$
$$7,25$$
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