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! LaTeX Error: \begin{document} ended by \end{enumerate}.

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l.45 \end{enumerate}
                    
! Extra \endgroup.
<recently read> \endgroup 
                          
l.45 \end{enumerate}
                    
[1] (./4.aux) )
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Output written on 4.dvi (1 page, 2244 bytes).
Transcript written on 4.log.