$$\left. \begin{array} { l } { 6 + 4 } \\ { 6 + 2 } \\ { 15 } \\ { 15 } \end{array} \right.$$
$8,10,15,15$
$$sort(10,6+2,15,15)$$
$$sort(10,8,15,15)$$
$$10$$
$$8,10$$
$$8,10,15$$
$$8,10,15,15$$
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$10,\ 8,\ 15,\ 15$
