question: Which film actors (actresses) played a role in more than 30 films? List his or her first name and last name.
#1 return film actors 
#2 return film actresses 
#3 return films #1 played a role in 
#4 return films #2 played a role in 
#5 return number of  #3 for each #1 
#6 return number of  #4 for each #2 
#7 return #1 where #5 is  more than  30 
#8 return #2 where #6 is  more than  30 
#9 return first names of #7 
#10 return last names of #7 
#11 return first names of #8 
#12 return last names of #8 
#13 return #9 ,  #10 
#14 return #11 ,  #12 
#15 return #13 ,  #14