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$\begingroup$ This is a good attempt and it's along the lines I had in mind for an answer but it doesn't work because the inverse is not unique. For example, the graph O<->O O O will be converted to the graph O-O O O O-O O O but then this latter could have also come from the directed graph O->O O->O O O, so the process is not reversible. $\endgroup$

Heterotic
– Heterotic

2014-01-15 13:26:53 +00:00
Commented Jan 15, 2014 at 13:26
$\begingroup$ I added a picture to make it clearer. $\endgroup$

adrianN
– adrianN

2014-01-15 14:54:42 +00:00
Commented Jan 15, 2014 at 14:54

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