$$\left. \begin{array} { l } { 5 - ( - 11 ) } \\ { 91 } \\ { 811 } \\ { 421 } \\ { 81011 } \end{array} \right.$$
$16,91,421,811,81011$
$$sort(5+11,91,811,421,81011)$$
$$sort(16,91,811,421,81011)$$
$$16$$
$$16,91$$
$$16,91,811$$
$$16,91,421,811$$
$$16,91,421,811,81011$$
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$16,\ 91,\ 811,\ 421,\ 81011$