question: What are the names of colleges in LA that have more than 15,000 students and of colleges in AZ with less than 13,000 students?
#1 return colleges  
#2 return #1 in LA 
#3 return students  in #2 
#4 return number of  #3 for each #2 
#5 return #2 where #4 is  more than 15,000 
#6 return #1 in AZ 
#7 return students  in #6 
#8 return number of #7 for each #6 
#9 return #6 where #8 is  less than 13,000 
#10 return #5 ,  #9 
#11 return names of  #10