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\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\begin{document}
Solve a system of linear equations:
\begin{equation}
\left\{\begin{array}{l}x + y = 3\\x - y = 1\end{array}\right.\end{equation}
\end{document}
If you try to parse the following TeX file:
the parser will raise an error:
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