Notes
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--converted the SOME keyword to EXCEPT
select p1.pid, p2.pid from person p1, person p2, knows k
where p1.pid = k.pid1 and p2.pid = k.pid2
EXCEPT
select p1.pid, p2.pid from person p1, person p2, knows k, person pSOME, knows kSOME
where p1.pid = k.pid1 and p2.pid = k.pid2 and pSOME.pid = kSOME.pid2 AND kSOME.pid1 = p1.pid AND p2.birthYear > pSOME.birthyear
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