List the states which have between 2 to 4 staffs living there.
return states ;return staff living in #1 ;return number of  #2 for each  #1 ;return #1 where #3 is  at least 2 ;return #1 where #3 is  at most 4 ;return #1 of  both #4 and  #5
['select', 'project', 'group', 'comparative', 'comparative', 'intersection']