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Thanks! I hadn't thought of vacuous truths before. Good to know for what to do in the future.
https://en.wikipedia.org/wiki/Vacuous_truth
Why do your random test cases say that it should return True if the letter never appears in the first place? (I would have intuitively thought that in such a case, the function should return false.) The problem description doesn't explain what we should do when a letter never appears.