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Starting & Ending ::document::
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Your input file must contain the following commands as a
minimum:

\documentclass{class}
\begin{document}
  ... your text goes here ...
\end{document}

where the class selected is one of the valid classes for
LaTeX. See section

Document Classes (and see section Overview of LaTeX and
Local Guide), for details of the various document classes
available locally.

You may include other LaTeX commands between the
\documentclass and the \begin{document} commands (i.e., in
the `preamble').