\begin{tikzpicture} \begin{pgfonlayer}{nodelayer} \node [style=none] (0) at (-4, 0) {}; \node [style=none] (1) at (0, 4) {}; \node [style=none] (2) at (4, 0) {}; \node [style=none] (3) at (0, -4) {}; \node [style=none] (4) at (0, 2) {}; \node [style=none] (5) at (0, 0) {}; \node [style=none] (6) at (1, 1) {}; \node [style=none] (7) at (-1, 1) {}; \node [style=none] (8) at (0, 3) {g}; \node [style=none] (9) at (-2.75, 0) {e}; \node [style=none] (10) at (-1, -2) {f}; \node [style=none] (11) at (-2.775, 0.25) {}; \node [style=none] (12) at (-2.725, -0.25) {}; \node [style=none] (13) at (-1.25, -2) {}; \node [style=none] (14) at (-0.25, 3) {}; \end{pgfonlayer} \begin{pgfonlayer}{edgelayer} \draw [bend right=45] (0.center) to (3.center); \draw [bend right=45] (3.center) to (2.center); \draw [bend left=45] (1.center) to (2.center); \draw [bend left=45] (0.center) to (1.center); \draw [bend right=315] (5.center) to (7.center); \draw [bend left=45] (7.center) to (4.center); \draw [bend left=45] (4.center) to (6.center); \draw [bend left=45] (6.center) to (5.center); \draw [bend right] (12.center) to (13.center); \draw [bend left=45] (11.center) to (14.center); \end{pgfonlayer} \end{tikzpicture}