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- SELECT H.hacker_id, H.name, S.submission_id FROM Hackers AS H
- INNER JOIN Submissions AS S ON H.hacker_id = S.hacker_id
- INNER JOIN Challenges AS C ON S.challenge_id = C.challenge_id
- INNER JOIN Difficulty AS D ON C.difficulty_level = D.difficulty_level
- WHERE S.score = D.score
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