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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').