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+%% LaTeX2e file `etocsnippet-28.tex'
+%% generated by the `filecontentshere' environment
+%% from source `etoc' on 2019/11/17.
+%%
+% \newtoks\treetok % put this (uncommented) preferably in the preamble
+% \newtoks\sectiontok
+% \newtoks\subsectiontok
+\newcommand*{\treenode}{}
+
+\newcommand*{\appendchildtree}[2]{% token list t1 becomes: t1 child {t2}
+ \edef\tmp{\the#1 child {\the#2}}%
+ #1\expandafter{\tmp}%
+}
+\newcommand*{\preparetreenode}{%
+ \tmptok\expandafter{\etocthelinkednumber}% expanded one time (mandatory)
+ \edef\treenode{node {\the\tmptok}}%
+}
+
+\etocsetstyle{section}
+ {\etocskipfirstprefix}
+ {\appendchildtree\treetok\sectiontok}
+ {\preparetreenode \sectiontok\expandafter{\treenode}}
+ {\appendchildtree\treetok\sectiontok}
+
+\etocsetstyle{subsection}
+ {\etocskipfirstprefix}
+ {\appendchildtree\sectiontok\subsectiontok}
+ {\preparetreenode \subsectiontok\expandafter{\treenode}}
+ {\appendchildtree\sectiontok\subsectiontok}
+
+\etocsettocstyle
+ {\treetok{\node {\hyperref[part:overview]{Overview}}}}
+ {\global\appendtotok\treetok{ ;}}
+
+\begin{figure}[thbp!]\centering
+ \etocsetnexttocdepth{subsection}
+ \tableofcontents \label{toc:molecule} \ref{toc:overview}
+ \hypersetup{hidelinks}%
+ \begin{tikzpicture}
+ [grow cyclic,
+ level 1/.style={level distance=4cm,sibling angle=72},
+ level 2/.style={level distance=2cm,sibling angle=60},
+ every node/.style={ball color=red,circle,text=SkyBlue},
+ edge from parent path={[dashed,very thick,color=cyan]
+ (\tikzparentnode) --(\tikzchildnode)}]
+ \the\treetok
+ \end{tikzpicture}
+\end{figure}