\begin{frame}{Table of contents}
  \setbeamertemplate{section in toc}[sections numbered]
  \setbeamertemplate{subsection in toc}[square]
  \tableofcontents[sections={2}]
\end{frame}


\subsection{Idea}

\begin{frame}{}

\end{frame}

\subsection{Test1}
\subsection{Test2}

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