Beamer : sections non numérotées

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\documentclass{beamer}
\usetheme{Warsaw}
\setbeamerfont{section in toc}{series=\bfseries}
\setbeamerfont{subsection in toc}{series=\bfseries}
\setbeamerfont{subsubsection in toc}{series=\bfseries,size=\small}
\setbeamertemplate{section in toc}{\leavevmode\@Alph\inserttocsectionnumber. \inserttocsection\par}
\setbeamertemplate{subsection in toc}{\leavevmode\normalsize\usebeamerfont{subsection in
        toc}\leftskip=2.4em\usebeamerfont{subsection in toc}\rlap{\hskip-1.2em\inserttocsubsectionnumber. }\inserttocsubsection\par}
\setbeamertemplate{subsubsection in toc}{\leavevmode\normalsize\usebeamerfont{subsubsection in
        toc}\leftskip=4.2em\usebeamerfont{subsubsection in toc}%
    \rlap{\hskip-1.2em\@alph\inserttocsubsubsectionnumber. }\inserttocsubsubsection\par}
\makeatother
% Table des matières qui apparaît au début de chaque division :
\AtBeginSection{%
    \begin{frame}
    %   \frametitle{Plan}
    \tableofcontents[sectionstyle=show/shaded,subsectionstyle=hide,subsubsectionstyle=hide]
\end{frame}
}
\AtBeginSubsection{%
\begin{frame}<beamer>
%   \frametitle{Plan}
\tableofcontents[sectionstyle=show/hide,subsectionstyle=show/shaded/hide,subsubsectionstyle=hide]
\end{frame}
}
\AtBeginSubsubsection{%
\begin{frame}<beamer>
%   \frametitle{Plan}
\tableofcontents[sectionstyle=show/hide,subsectionstyle=show/hide,subsubsectionstyle=show/shaded/hide]
\end{frame}
}
\author{}
\date{}
\title{Titre}
 
 
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