query: SELECT class_code FROM CLASS WHERE class_room  =  'KLR209'
question: Of all courses that take place in room KLR209 List codes.
query_toks: SELECT class_code FROM CLASS WHERE class_room = 'KLR209 '
query_toks_no_value: select class_code from class where class_room = value
question_toks: Of all courses that take place in room KLR209 List codes.