Find the official names of cities with population bigger than 1500 or smaller than 500.
return cities ;return populations of  #1 ;return #1 where  #2 is  higher than 1500 ;return #1 where  #2 is  lower than 500 ;return #3 or  #4 ;return official names of  #5
['select', 'project', 'comparative', 'comparative', 'union', 'project']