How may cubes are both the same size and material?
return cubes ;return sizes of #1 ;return materials of #1 ;return #1 where  #2 are the  same ;return #1 where  #3 are the  same ;return #1 in  both  #4 and #5 ;return number of #6
['select', 'project', 'project', 'comparative', 'comparative', 'intersection', 'aggregate']