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I'd like to draw arrows on small circles. The "decorate" method works well on large ones but the following
\begin{tikzpicture}[scale=0.5,
decoration={markings,
mark= at position 0.75 with {\arrow{Stealth[width=2pt,length=3pt]}}}]
\foreach \t in {0,...,7} {
\draw[postaction=...