\qi{2} \cdot
\begin{tikzpicture}[baseline]
    \clip (-.6,-1.3) rectangle (.8,1.3);
    \node at (0,.7) (top) [rectangle,draw] {$ \hspace{.3 cm} P \hspace{.3cm} $};
    \node at (0,-.7) (bottom) [rectangle,draw]{$ \hspace{.3cm} P \hspace{.3cm} $};

    \draw (top.-60)--(bottom.60);
    \draw (top.-145)--(bottom.145);
    \node at (-.1,0) {...};
    \draw (top.-35) arc (-180:0:.2cm) -- ++(90:1cm);
    \draw (bottom.35) arc (180:0:.2cm) -- ++(-90:1cm);

    \draw (top.35) -- ++(90:1cm);
    \draw (top.60) -- ++(90:1cm);
    \node at (-.1,1.2) {...};
    \draw (top.145) -- ++(90:1cm);

    \draw (bottom.-35) -- ++(-90:1cm);
    \draw (bottom.-60) -- ++(-90:1cm);
    \node at (-.1,-1.2) {...};
    \draw (bottom.-145) -- ++(-90:1cm);
\end{tikzpicture}
& = \qi{2} \cdot
\begin{tikzpicture}[baseline]
    \clip (-1.5,-1.3) rectangle (2,1.3);
    \node at (0,.7) (top) [rectangle,draw] {$\frac{1}{2}(\JW{2n-2}+S)$};
    \node at (0,-.7) (bottom) [rectangle,draw]{$\frac{1}{2}(\JW{2n-2}+S)$};

    \draw (top.-30)--(bottom.30);
    \draw (top.-163)--(bottom.163);
    \node at (-.1,0) {...};
    \draw (top.-17) arc (-180:0:.2cm) -- ++(90:1cm);
    \draw (bottom.17) arc (180:0:.2cm) -- ++(-90:1cm);

    \draw (top.17) -- ++(90:1cm);
    \draw (top.30) -- ++(90:1cm);
    \node at (-.1,1.2) {...};
    \draw (top.163) -- ++(90:1cm);

    \draw (bottom.-17) -- ++(-90:1cm);
    \draw (bottom.-30) -- ++(-90:1cm);
    \node at (-.1,-1.2) {...};
    \draw (bottom.-163) -- ++(-90:1cm);
\end{tikzpicture}
