Find the id of instructors who taught a class in Fall 2009 but not in Spring 2010.
SELECT id FROM teaches WHERE semester  =  'Fall' AND YEAR  =  2009 EXCEPT SELECT id FROM teaches WHERE semester  =  'Spring' AND YEAR  =  2010
SELECT id FROM teaches WHERE semester  =  'Fall' AND YEAR  =  2009 EXCEPT SELECT id FROM teaches WHERE semester  =  'Spring' AND YEAR  =  2010
[{'ID': '3335'}, {'ID': '36897'}, {'ID': '43779'}, {'ID': '63287'}, {'ID': '6569'}, {'ID': '99052'}]