How many more milligrams is the RDA intake of those 9-13 than those 1-3 years old?
return those that are 9-13 years old ;return those that are 1-3 years old ;return the  RDA intake in  milligrams of #1 ;return the  RDA intake in  milligrams of #2 ;return the  difference of #3 and  #4
['select', 'select', 'project', 'project', 'arithmetic']