\node[draw,circle,label=below:{$\mathrm{base}$},fill,outer sep=0.1cm, inner sep=0pt, minimum size=0.1cm] (a0) at (0, -1) {};
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\draw[->] (0, 0) circle (1cm);
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\node[] (loop) at (0, 0) {$\mathrm{loop}\ i$};
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