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%%  Example 01-03-5 
%%  Copyright (C) 2017 Herbert Voss
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\documentclass[]{screxa}
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\begin{document}
\begin{eqnarray*}
y & = & d\label{eq:3}\\
y & = & cx+d\\
y & = & bx^{2}+cx+d\\
y & = & ax^{3}+bx^{2}+cx+d\label{eq:4}
\end{eqnarray*}
\end{document}
