\documentclass[10pt]{scrartcl}
\usepackage{pdfpages}
\usepackage{geometry}
\geometry{paperwidth=210mm,paperheight=297mm} % A4
\setlength\topmargin{-36mm}
\setlength\oddsidemargin{-28mm}
\pagestyle{empty}

\begin{document}
  \input{tmp.tex}
\end{document}

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