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%%  Example 03-01-6 
%%  Copyright (C) 2016 Herbert Voss
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\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{328.62788pt}
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\begin{document}
\[\int\int_D \mathrm{d}x\mathrm{d}y \quad        \int\!\int_D \mathrm{d}x\,\mathrm{d}y\]
\[\int\!\!\int_D \mathrm{d}x\,\,\mathrm{d}y \quad\int\!\!\!\int_D \mathrm{d}x\,\,\,\mathrm{d}y\]
\[\int\!\!\!\!\int_D \mathrm{d}x\,\,\,\,\mathrm{d}y \quad
  \int\!\!\!\!\!\int_D \mathrm{d}x\,\,\,\,\,\mathrm{d}y\]
\[\int\!\!\!\int_D \mathrm{d}x\,\mathrm{d}y\]
\end{document}
