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select a.name from friends b join packages c on b.friend_id=c.id join packages d on b.id=d.id join students a on a.id=b.id where C.salary > d.salary order by c.salary
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select a.name from friends b join packages c on b.friend_id=c.id join packages d on b.id=d.id join students a on a.id=b.id where C.salary > d.salary order by c.salary