\documentclass{amsart}

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\input{\pathtotrunk text/article_preamble.tex}

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\begin{document}
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module composition

action

$n$-category composition

$B B_1 B_2 u_1 u_2 u r r u_i, u_j u_k u_l$

\begin{align*}
abmab & \\
v_1 v_2 v_3 v_4 A
\end{align*}
\end{document}