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  • $\begingroup$ Have you read the original question?Which don't mean that color demand maybe. $\endgroup$ Commented Dec 22, 2016 at 23:48
  • $\begingroup$ @yode If you refer to the linked article you will see that it does represent multigraphs and that different colors can be used to represent different types of edges (1=mail, 2=meet, etc.). Les us know if something is unclear. $\endgroup$ Commented Dec 23, 2016 at 0:17