$$\left. \begin{array} { l } { + 18 , + 9 , 0 , + 1 , + 5 , + 20 } \end{array} \right.$$
$0,1,5,9,18,20$
$$18$$
$$9,18$$
$$0,9,18$$
$$0,1,9,18$$
$$0,1,5,9,18$$
$$0,1,5,9,18,20$$
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$18,\ 9,\ 0,\ 1,\ 5,\ 20$