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you've got 1k+ Excel files which are snapshots of voting results for a county, each worksheet is one "race", each row is a precinct and each column is an entry on the ballot and vote type (mail, in-person, provisional). The timestamp is in the file name. Find places where the vote count _decreased_ going forward in time for any one cell across two files. Use whatever you're comfortable with

I did both of these things recently, they each took me about an hour (3/3)