What are the locations that have both tracks with more than 90000 seats, and tracks with fewer than 70000 seats?
return tracks  ;return seats of  #1 ;return number of  #2 for each  #1 ;return #1 where #3 is  higher than 90000 ;return #1 where #3 is  lower than 70000 ;return locations of  both #4 and  #5
['select', 'project', 'group', 'comparative', 'comparative', 'intersection']