How many yards longer was Philip Rivers TD pass than Damon Huard's?
return Philip Rivers ;return TD pass of #1 ;return yards of #2 ;return Damon Huard ;return TD pass of #4 ;return yards of #5 ;return difference of #3 and  #6
['select', 'project', 'project', 'select', 'project', 'project', 'arithmetic']