$$\left. \begin{array} { l } { 2 : 1 } \\ { - 1 } \\ { \quad \frac { 4 } { 2 } - 9 - 3 + 8 + 8 } \end{array} \right.$$
$-1,2,6$
$$sort(2,-1,\frac{4}{2}-9-3+8+8)$$
$$sort(2,-1,2-9-3+8+8)$$
$$sort(2,-1,-7-3+8+8)$$
$$sort(2,-1,-10+8+8)$$
$$sort(2,-1,-2+8)$$
$$sort(2,-1,6)$$
$$2$$
$$-1,2$$
$$-1,2,6$$
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$2,\ -1,\ 6$
