\documentclass[12pt]{article}
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%TCIDATA{Created=Mon Aug 19 14:52:24 1996}
%TCIDATA{LastRevised=Sat Apr 05 07:37:19 1997}
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%\input{tcilatex}
\begin{document}


This is \ a test. $\ $

\[
x^{2}+y^{2}=1
\]

\end{document}