$
\begin{tikzpicture}[baseline]
 \node (S) [circle,draw] {$ S$};
  \filldraw (S.157) circle (.5mm);
     \draw (S.135) -- +(135:3mm);
     \draw (S.90) -- +(90:3mm);
     \draw (S.45) .. controls +(45:3mm) and +(0:3mm) .. (S.0);
     \draw (S.-45) node [below] {$\cdot$};
      \draw (S.-90) node [below] {$\cdot$};
     \draw (S.-135) node [below] {$\cdot$};
     \draw (S.180) -- +(180:3mm);
\end{tikzpicture}
=
\begin{tikzpicture}[baseline]
\node[xshift=2cm] (S') [circle,draw] {$ S$};
 \filldraw (S'.157) circle (.5mm);
     \draw (S'.135) -- +(135:3mm);
     \draw (S'.90) -- +(90:3mm);
     \draw (S'.45) -- +(45:3mm);
     \draw (S'.0) .. controls +(0:3mm) and +(-45:3mm) .. (S'.-45);
      \draw (S'.-90) node [below] {$\cdot$};
     \draw (S'.-120) node [below] {$\cdot$};
     \draw (S'.-150) node [below] {$\cdot$};
     \draw (S'.180) -- +(180:3mm);
\end{tikzpicture}
= \cdots =0
$
