Which groups had between 20000 and 25000 people?
return groups ;return people of #1 ;return number of  #2 for each #1 ;return #1 where #3 is at least 20000 ;return #1 where #3 is at most 25000 ;return #1 in  both #4 and  #5
['select', 'project', 'group', 'comparative', 'comparative', 'intersection']