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\documentclass[12pt,paper=a4]{scrbook}\usepackage[english]{polyglossia}\usepackage{blindtext}\usepackage{parallel}\newlength{\myindent}\setlength{\myindent}{\the\parindent}\setlength{\parindent}{0pt}\addtolength{\parskip}{\baselineskip}\newcommand{\speaker}[1]{\ignorespaces\par\hspace{2\myindent}\textsc{#1}\\*}\newcommand{\Mytext}{%\speaker{Jan}\blindtext\speaker{Arnold}\vspace{-\baselineskip}\begin{Parallel}{}{}\ParallelLText{\blindtext}\ParallelRText{\itshape \blindtext}\end{Parallel}\speaker{Jan}\blindtext}\begin{document}\Mytext\Blinddocument\Mytext\end{document}