\begin{tikzpicture}
	\begin{pgfonlayer}{nodelayer}
		\node [style=none] (1) at (2.5, 0) {};
		\node [style=none] (2) at (0, -2.5) {};
		\node [style=none] (3) at (-2.5, 0) {};
		\node [style=none] (4) at (0, 2.5) {};
		\node [style=none] (5) at (0, 0.5) {};
		\node [style=none] (6) at (0, -2) {};
		\node [style=none] (7) at (-1.25, -0.75) {};
		\node [style=none] (8) at (1.25, -0.75) {};
		\node [style=none] (9) at (0, -1.5) {C};
		\node [style=none] (10) at (0, -3) {D};
		\node [style=none] (11) at (0, 0) {B};
		\node [style=none] (12) at (0, 3) {A};
	\end{pgfonlayer}
	\begin{pgfonlayer}{edgelayer}
		\draw [bend right=45] (4.center) to (3.center);
		\draw [bend right=45] (3.center) to (2.center);
		\draw [bend right=45] (2.center) to (1.center);
		\draw [bend left=45] (4.center) to (1.center);
		\draw [bend left=45] (5.center) to (8.center);
		\draw [bend left=45] (8.center) to (6.center);
		\draw [bend left=45] (6.center) to (7.center);
		\draw [bend left=45] (7.center) to (5.center);
		\draw (4.center) to (5.center);
		\draw (6.center) to (2.center);
	\end{pgfonlayer}
\end{tikzpicture}