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I saw an answer to a question and thought there was an error in it. I wrote a comment and downvoted it. Then the original poster responded to my comment and it turns out I was mistaken and the answer is correct as originally written. Now I can't undo my downvote because the answer was not edited. The answer was fine all along, I was wrong in downvoting it. Why can I not fix this?

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marked as duplicate by Glorfindel, John Omielan, Shailesh, José Carlos Santos, Sil Mar 27 at 20:28

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