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\documentclass[blue]{beamer}
\mode<beamer> {
\usetheme{warsaw}
}
\begin{document}
\begin{frame}
\frametitle{}
\tableofcontents
\end{frame}
\frame[plain]{ \large
\begin{enumerate}
\item PUNKT1
\item PUNKT2
\item PUNKT3
\end{enumerate}
}
\section{PUNKT1}
\frame[plain]{bla1}
\section{PUNKT2}
\frame[plain]{bla2}
\section{PUNKT3}
\frame[plain]{bla3}
\end{document}

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\documentclass[blue,t]{beamer}