Answer by Atahan Haznedar for Making Argument Diagrams in LaTex

Hello after searching in the internet I saw people doing Argument Diagrams with tikzcd. This is example of something I did by copying other peoples work.

        \begin{center}            \begin{tikzcd}[row sep=1.5em,column sep=0.3em]                {1} \arrow{d} \& {} \& {} \& {} \& {} \& {} \& {}  \\                {2} \& {+} \& {3} \& {+}\arrow{d} \& {4} \& {+} \& {5}  \\                {} \& {} \& {} \& {6} \& {} \& {} \& {}  \\            \end{tikzcd}        \end{center}

And here is the image of the output:

However I want to add a horizontal line under second row.

I couldn’t find anyway to do it. Are you guys familiar with how to do such a thing.

Thanks