$$\left. \begin{array} { l } { 15 , 20 } \\ { 16 , 30 } \\ { 19 , 47 } \end{array} \right.$$
$15,16,19,20,30,47$
$$15$$
$$15,20$$
$$15,16,20$$
$$15,16,20,30$$
$$15,16,19,20,30$$
$$15,16,19,20,30,47$$
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$15,\ 20,\ 16,\ 30,\ 19,\ 47$