\begin{tikzpicture}
	\node (first) at (-1,0) [rectangle,draw] {$\;\; \JW{n} \;\;$};
	\node (second) at (1,0) [rectangle,draw] {$\;\; \JW{n} \;\;$};
	\draw (first.45) .. controls ++(60:6mm) and ++(120:6mm) .. (second.135);
	\draw (first.90) .. controls ++(60:9mm) and ++(120:9mm) .. (second.90);
	\draw (first.135) .. controls ++(60:12mm) and ++(120:12mm) .. (second.45);

\end{tikzpicture}