$
\begin{tikzpicture}[baseline]
    \node (S) [circle,draw] {$^\star S$};
    \draw (S.180)-- +(180:3mm);
    \draw (S.135)-- +(135:3mm);
    \draw (S.90)-- +(90:3mm);
    \draw (45:.7cm) node {.};
    \draw (0:.7cm) node {.};
    \draw (-45:.7cm) node {.};
    \draw (S.-135)-- +(-135:3mm)node [above left] {$\star$};
    \draw (S.-90)-- +(-90:3mm);
\end{tikzpicture}
= 
\begin{tikzpicture}[baseline]
    \node (S) [circle,draw] {$^\star S$};
    \draw (S.180)-- +(180:3mm) node [above] {$\star$};
    \draw (S.135)-- +(135:3mm);
    \draw (S.90)-- +(90:3mm);
    \draw (45:.7cm) node {.};
    \draw (0:.7cm) node {.};
    \draw (-45:.7cm) node {.};
    \draw (S.-135)-- +(-135:3mm);
    \draw (S.-90)-- +(-90:3mm);
\end{tikzpicture}
$
