Yes, but it also holds a big trapdoor, the graphical information does not give you an idea on how many people moved at what directon between two states. The graph between A and B would look the same no matter whether 90% of the people move from A to B, or the other way around, or coming and going people are equal-sized groups. But this is what the real important info in this graph would be.
Or am I missing something?
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