$
\begin{tikzpicture}[baseline]
	\clip (-.8,-1.3) rectangle (.8,1.3);
	 \node at (0,.6) (S) [circle,draw] {$ S$};
	 \filldraw (S.180) circle (.5mm);
	\node at (0,-.6) (S') [circle,draw] {$S$};
	 \filldraw (S'.180) circle (.5mm);

     \draw (S.203)..controls +(203:2mm) and +(157:2mm) .. (S'.157);
     \draw (S'.90) node[above] {$\ldots$};
     \draw (S.337)..controls +(337:2mm) and +(23:2mm) ..
     (S'.23);
     \draw (S.45) -- +(45:1cm);
     \draw (S.90) node [above] {$\ldots$};
     \draw (S.135) -- +(135:1cm);
     \draw (S'.225) -- +(-135:1cm);
     \draw (S'.270) node [below] {$\ldots$};
     \draw (S'.-45) -- +(-45:1cm);
\end{tikzpicture}
=
\begin{tikzpicture}[baseline]
	\clip (-.8,-1.3) rectangle (.8,1.3);
    \node (0,0) (JW) [rectangle,draw] {$\JW{2n-2}$};

    \draw (JW.35) -- +(90:11mm);
    \draw (JW.90) node [above] {$\cdots$};
    \draw (JW.145) -- +(90:11mm);

    \draw (JW.-35) -- +(-90:11mm);
    \draw (JW.-90) node [below] {$\cdots$};
    \draw (JW.-145) -- +(-90:11mm);
\end{tikzpicture}
$