$$\left. \begin{array} { l } { 21 , 356 } \\ { + 877 , 947 } \\ { + 14 , 313 } \end{array} \right.$$
$14,21,313,356,877,947$
$$21$$
$$21,356$$
$$21,356,877$$
$$21,356,877,947$$
$$14,21,356,877,947$$
$$14,21,313,356,877,947$$
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$21,\ 356,\ 877,\ 947,\ 14,\ 313$