$$\left. \begin{array} { l } { 8 + ( 1 ) + ( - 7 ) } \\ { 43 + ( - 39 ) + ( - 26 ) + 41 } \end{array} \right.$$
$2,\ 19$
$$sort(9-7,43-39-26+41)$$
$$sort(2,43-39-26+41)$$
$$sort(2,4-26+41)$$
$$sort(2,-22+41)$$
$$sort(2,19)$$
$$2,19$$
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