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# Time for action – listing packages by topic

We shall refine the package list by introducing categories:

1. Refine the aforementioned highlighted itemize environment of our example in the following way:
\begin{itemize}
\item Page layout
\begin{itemize}
\item geometry
\item typearea
\end{itemize}
\begin{itemize}
\item fancyhdr
\item scrpage2
\end{itemize}
\item Line spacing
\begin{itemize}
\item setspace
\end{itemize}
\end{itemize}
2. Typeset to see the new list:

## What just happened?

We simply inserted another list inside the list. Up to four levels are possible, otherwise LaTeX would stop and print out the error message ! LaTeX Error: ...

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