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selectsub.hacker_id,hak.namefromsubmissionssub,challengescha,hackershak,difficultydifwheresub.challenge_id=cha.challenge_idandsub.hacker_id=hak.hacker_idandcha.difficulty_level=dif.difficulty_level/*to eliminate submissions that did not earn full score */anddif.score=sub.score/* further eliminate hackers who only had one full-score submission */groupbysub.hacker_id,hak.namehavingcount(sub.score)>1/* display by the order stated in the proble, */orderbycount(sub.score)desc,sub.hacker_id;
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i hope with help!