How many yards longer was Graham's first field goal than his second one?
return Graham ;return field goals of #1 ;return first of #2 ;return #2 besides  #3 ;return first of #4 ;return yards of #3 ;return yards of #5 ;return difference of #6 and  #7
['select', 'project', 'aggregate', 'discard', 'aggregate', 'project', 'project', 'arithmetic']