How many objects with the same material out number the rest?
return objects ;return materials of #1 ;return #1 where #2 is the  same ;return #1 besides  #3 ;return number of  #3 ;return number of  #4 ;return the  difference of #5 and  #6
['select', 'project', 'comparative', 'discard', 'aggregate', 'aggregate', 'arithmetic']