question: How many more yards did Manning pass for than Rivers?
#1 return Manning 
#2 return Rivers 
#3 return passes of #1 
#4 return passes of #2 
#5 return yards of #3 
#6 return yards of #4 
#7 return sum of #5 
#8 return sum of #6 
#9 return difference of #7 and  #8