doc-src/TutorialI/Trie/document/Option2.tex

added priority, priority_fn;

%
\begin{isabellebody}%
\isanewline
\isacommand{datatype}\ {\isacharprime}a\ option\ {\isacharequal}\ None\ {\isacharbar}\ Some\ {\isacharprime}a\end{isabellebody}%
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