What are the ids of the two department store chains with the largest number of department stores?
return department store chains ;return department stores of #1 ;return number of  #2 for each #1 ;return the  two highest of #3 ;return #1 where #3 is equal to any of #4 ;return ids of #5
['select', 'project', 'group', 'aggregate', 'comparative', 'project']