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May 20, 2020 at 18:08 comment added Claus Thanks a lot for providing a graph theoretic proof! I am very interested in it. In your answer, you offer to provide a graphic representation of this, I would be grateful if you could do that. I am really interested in your proof argument, and the way it uses the dual graph.
Nov 12, 2012 at 5:39 history answered john mangual CC BY-SA 3.0