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Hi,

This my code :
\documentclass{article}
\usepackage{tikz}

\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}
[acteur/.style={circle, fill=black,thick, inner sep=2pt, minimum size=0.2cm}]
\node (a1) at ( 2.5,2.5) [acteur][label=A]{};
\node (a2) at ( 2,1)[acteur][label={B ...