question: Which member names are shared among members in the party with the id 3 and the party with the id 1?
#1 return parties 
#2 return ids of #1 
#3 return #1 where #2 is  3 
#4 return #1 where #2 is  1 
#5 return members in #3 
#6 return members in #4 
#7 return names of #5 
#8 return names of #6 
#9 return names in both #7 and #8