How many yards shorter was the shortest rushing touchdown compared to the shortest field goal?
return rushing touchdowns ;return field goals ;return yards of #1 ;return yards of #2 ;return the  shortest  of #3 ;return the  shortest  of #4 ;return the  difference of #5 and  #6
['select', 'select', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']