$$\left. \begin{array} { l } { 11 } \\ { + 1 } \\ { + 1 } \\ { 0 } \end{array} \right.$$
$0,1,1,11$
$$11$$
$$1,11$$
$$1,1,11$$
$$0,1,1,11$$
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$11,\ 1,\ 1,\ 0$