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Summary edit

Source edit

%&latex
\documentclass{article}
\usepackage[]{diagxy}
\pagestyle{empty}

\begin{document}
$$\bfig
\Square[
  A \otimes A \otimes A`
  A \otimes A`
  A \otimes A`
  A
;
  \mu_A \otimes \mathrm{id}_A`
  \mathrm{id}_A \otimes \mu_A`
  \mu_A`
  \mu_A
]
\efig$$
\end{document}

Licensing edit

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