One that I got a long time ago was design an algorithm to sort a list of words by anagram - so the words 'cat' and 'act' would appear together.
When I got the generic 'sort list of words' question previously, I said I would send to the language's 'sort' command - any developer of mine that thought they were smarter than a tried-and-true honed api wouldn't be hired, or would be a risk of being fired if I found it in a code review. My rationalization allowed it to be a correct answer.
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