Sounds like the tree is what I need (since the data will be changing quite a bit). As for using a hash-map: wouldn't you need a sorted map to be able to pull out all the keys in a range? And then are the seq functions efficient for this? (I.E. if you drop a number of them to get to the beginning of the range, is the drop O(1) or O(n)?) Thanks for your help!
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