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    select h.Hacker_ID, Name from submissions s join challenges c on s.challenge_id=c.challenge_id join difficulty d on d.difficulty_level=c.difficulty_level join Hackers h on s.hacker_id=h.hacker_id

    where s.score=d.score group by h.Hacker_ID, Name having count(submission_id)>1 order by count(submission_id) desc,h.Hacker_ID