How many more objects of matte color are there than metallic color?
return objects ;return colors of #1 ;return #1 where #2 is  matte ;return #1 where #2 is  metallic ;return number of #3 ;return number of #4 ;return difference of #5 and  #6
['select', 'project', 'comparative', 'comparative', 'aggregate', 'aggregate', 'arithmetic']