Task: Question Generation
Input (English): #1 return cars sold 
#2 return #1 in  2013 
#3 return #1 in  2007 
#4 return number of  #2 
#5 return number of  #3 
#6 return the  difference of #4 and  #5
Output (English): How many fewer cars were sold in 2013 than in 2007?