\node[draw,circle,label=left:{$a$},fill,outer sep=0.1cm, inner sep=0pt, minimum size=0.1cm] (i0) at (-1, 0) {};
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\node[draw,circle,label=right:{$a$},fill,outer sep=0.1cm, inner sep=0pt, minimum size=0.1cm] (i1) at (1, 0) {};
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\draw[->] (i0) -> (i1) node [midway] {$\lambda i. a$};
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