\qi{m} \cdot
\begin{tikzpicture}[baseline]
    \node (0,0) (JW) [rectangle,draw] {$\; \; \JW{m} \; \;$};

    \draw [rounded corners=2mm] (JW.35) -- ++(90:4mm) -- ++(4mm,0mm) -- ++(0cm,-1.5cm) -- ++(-4mm,  0mm)-- (JW.-35);
    \draw (JW.60) -- +(90:5mm);
    \draw (JW. 110) node [above] {$\cdots$};
    \draw (JW.145) -- +(90:5mm);

    \draw (JW.-60) -- +(-90:5mm);
    \draw (JW.-110) node [below] {$\cdots$};
    \draw (JW.-145) -- +(-90:5mm);
\end{tikzpicture}
= \qi{m+1} \cdot
\begin{tikzpicture}[baseline]
    \node (0,0) (JW) [rectangle,draw] {$\; \JW{m-1} \;$};

    \draw (JW.35) -- +(90:5mm);
    \draw (JW. 90) node [above] {$\cdots$};
    \draw (JW.145) -- +(90:5mm);

    \draw (JW.-35) -- +(-90:5mm);
    \draw (JW.-90) node [below] {$\cdots$};
    \draw (JW.-145) -- +(-90:5mm);
\end{tikzpicture}
