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% A simple cycle
% Author : Jerome Tremblay
\documentclass{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\node[shape=circle,draw=blue] (A) at (0,0) {$v_1$};
\node[shape=circle,draw=red] (B) at (2,2) {$v_2$};
\node[shape=circle,draw=blue] (C) at (0,4) {$v_3$};
\path [-](A) edge node[left] {} (B);
\path [-](B) edge node[left] {} (C);
\end{tikzpicture}
\end{document}
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