% letter-0.tex
% Copyright 2008 Markus Kohm
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\documentclass[version=last]{scrlttr2}
\usepackage[ngerman]{babel}
\begin{document}
\begin{letter}{%
    Petra Mustermann\\
    Vor dem Berg 1\\
    12345 Musterhausen%
  }
\opening{Liebe Vereinsvorsitzende,}
\end{letter}
\end{document}