$$\left. \begin{array} { l } { \quad ( 5 \log _ { 9 } 81 ) ( \log _ { 5 } 25 ) } \\ { 18 } \end{array} \right.$$
$18,20$
$$sort(5\times 2\log_{5}\left(25\right),18)$$
$$sort(10\log_{5}\left(25\right),18)$$
$$sort(10\times 2,18)$$
$$sort(20,18)$$
$$20$$
$$18,20$$
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$20,\ 18$
