Find the locations where have both tracks with more than 90000 seats and tracks with less than 70000 seats.
return locations ;return tracks of  #1 ;return seats  of  #2 ;return #1 where  #3 is  more than  90000 ;return #1 where  #3 is  less than  70000 ;return #1 of  both #4 and #5
['select', 'project', 'project', 'comparative', 'comparative', 'intersection']