Task: Question Generation
Input (English): #1 return people 
#2 return #1 older than 23 
#3 return #1 younger than 20 
#4 return #1 of  both #2 and  #3 
#5 return hometowns of  #4
Output (English): From which hometowns did both people older than 23 and younger than 20 come from?