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\documentclass{article}
\usepackage{fontspec,lipsum}
\defaultfontfeatures{Ligatures=TeX}
%\usepackage[small,sf,bf]{titlesec}
 
%\setromanfont{Georgia}
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\begin{document}
\section{Introduction}
 
\lipsum[1]
 
\section{Nonsense}
 
\lipsum[2-4]
\end{document}


