How many spheres are the same material as the large purple cube?
return cube ;return #1 that is  large ;return #2 that is  purple ;return material of #3 ;return spheres ;return materials of #5 ;return #5 where #6 are the same as #4 ;return number of  #7
['select', 'filter', 'filter', 'project', 'select', 'project', 'comparative', 'aggregate']