question: List the states which have between 2 to 4 staffs living there.
#1 return states 
#2 return staff living in #1 
#3 return number of  #2 for each  #1 
#4 return #1 where #3 is  at least 2 
#5 return #1 where #3 is  at most 4 
#6 return #1 of  both #4 and  #5