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Definitely needed a couple hints to get going on this one. It finally clicked when read people were using coordinate based approaches. And as I write this I am realizing I probably could have made use of spatial tools for distance calculations. Oh well... nothing wrong with brushing up on grade school math.
@Greg_Murray This one was interesting - you can cheat and use 1 dimensional distance. I just #'ed the cells 0 to 9024 and then used abs(a-b) for distance. The absolute distance doesn't matter, only the sort order.