AlgorithmB.1.1
\begin{equation*} \begin{array}{rrrr} \amp\phantom{_1} \amp\phantom{_1} \amp \\ \amp 6 \amp 9 \amp 7 \\ + \amp 2 \amp 2 \amp 3 \\ \hline{} \amp \phantom{9 }\amp \phantom{2 }\amp \phantom{0} \end{array} \end{equation*}
\begin{equation*} \begin{array}{rrrr} \amp\phantom{_1} \amp\highlight{_1} \amp \\ \amp 6 \amp 9 \amp 7 \\ + \amp 2 \amp 2 \amp 3 \\ \hline{} \amp \phantom{9 }\amp \phantom{2 }\amp \highlight{0} \end{array} \end{equation*}
\begin{equation*} \begin{array}{rrrr} \amp\highlight{_1} \amp_1 \amp \\ \amp 6 \amp 9 \amp 7 \\ + \amp 2 \amp 2 \amp 3 \\ \hline{} \amp \phantom{9 }\amp \highlight{2} \amp 0 \end{array} \end{equation*}
\begin{equation*} \begin{array}{rrrr} \amp_1 \amp_1 \amp \\ \amp 6 \amp 9 \amp 7 \\ + \amp 2 \amp 2 \amp 3 \\ \hline{} \amp \highlight{9} \amp 2 \amp 0 \end{array} \end{equation*}
in-context