$$\left. \begin{array} { l } { 16 \cdot 1 - 1 } \\ { 10 \cdot 1 - 1 } \end{array} \right.$$
$9,15$
$$sort(16-1,10\times 1-1)$$
$$sort(15,10\times 1-1)$$
$$sort(15,10-1)$$
$$sort(15,9)$$
$$15$$
$$9,15$$
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$15,\ 9$
