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    SELECT A.Hacker_id,D.Name From Submissions A JOIN Challenges B ON A.challenge_id=B.challenge_id JOIN Difficulty C ON B.Difficulty_level=C.Difficulty_level JOIN Hackers D ON A.Hacker_id=D.Hacker_id where C.score=A.score group by A.Hacker_id, D.Name having count(A.challenge_id)>1 order by count(A.challenge_id) desc, A.Hacker_id asc