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  • Is necessary a loop of the files if the key is unique? Just an observation. Commented Dec 23, 2021 at 15:26
  • @schrodigerscatcuriosity I didn't see an explicit statement of uniqueness in the question so I assumed there might be zero or more rather than zero or one. (I did read "there is an entry for each file, but not necessarily a file for each entry" but I didn't see anything that said there would be at most one file per entry.) Commented Dec 23, 2021 at 15:35
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    Right, re-reading the question I realize that. I just assumed the file names where unique in its keys. Commented Dec 23, 2021 at 15:38