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@siwelwerd @AIMathematics @MitchKeller "won't be difficult" is based upon the fact that 90% of my changes were of the form
\begin{theorem}to<theorem>and\end{subactivity}to</task>. Inserting<p>tags is the trickiest.
\begin{theorem} to <theorem> and \end{subactivity} to </task>. Inserting <p> tags is the trickiest.