@ArturKrush In directed graph theory, which is important here, you don't get to create two differently named vertices that are the same vertex. B and F are the same vertex. So you have to pick one name or the other. But you don't get to keep both. You could keep them named separately if-and-only-if you introduce an edge between them with a finite conductance. But an ideal wire doesn't have a finite conductance.
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