Here it is cffndncr. Notice that I went in and made rules for each city since I can't figure it out. I tried to make a list on the second sheet of the cities that fall into a region (not up-to-date at the moment). Think of it as a radius. Cities that are closest are green (very close), then blue (a little travel but OK), then orange (not desired but doable), then red (not possible). Feel free to dump the rules in favour of four. As the list grows it's likely that more cities will need to be added and require more rules - rather tedious.
Thanks
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