How many cubes are made of the same material as the small gray sphere?
return the  small gray sphere ;return the  material that  #1 is  made of ;return cubes ;return the  materials that  #3 are made of ;return #3 where #4 is  the  same as #2 ;return number of  #5
['select', 'project', 'select', 'project', 'comparative', 'aggregate']