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\begin{tikzpicture}
\path [use as bounding box] (-2,-2) rectangle (2,2);
\begin{pgfonlayer}{nodelayer}
\node [style=none] (0) at (-0.5, 0) {};
\node [style=none] (1) at (0.5, 0) {};
\end{pgfonlayer}
\begin{pgfonlayer}{edgelayer}
\draw [in=90, out=90, looseness=0.75] (0.center) to (1.center);
\draw [in=-90, out=270, looseness=0.75] (1.center) to (0.center);
\end{pgfonlayer}
\end{tikzpicture}
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