question: How many more touchdowns were scored in the first half compared to the second half?
#1 return touchdowns 
#2 return #1 that were scored in  the  first half  
#3 return #1 that were scored in  the  second half  
#4 return number of  #2 
#5 return number of  #3 
#6 return difference of #4 and  #5