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How about the grid? Why is it the way it is? It's 8 blocks to the mile for most of the city, but not from Madison to 31st, where it's 12 blocks to the mile (Madison to Roosevelt), then 10 blocks to the mile (Roosevelt to Cermak/2200S), then 9 blocks to 31st, before it resumes the usual 8-blocks-to-the-mile pattern.

Asked by Peter Pawinski

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