Task: Question Generation
Input (English): #1 return Tunis 
#2 return Sfax 
#3 return people of #1 
#4 return people of #2 
#5 return number of  #3 
#6 return number of  #4 
#7 return the  difference of #5 and  #6
Output (English): How many more people lived in Tunis than Sfax?