How many objects are the same material as the one behind the sphere in front?
return the  sphere in  front ;return the  object behind of #1 ;return objects ;return #3 besides  #2 ;return material of #2 ;return materials of #4 ;return #4 where #6 is the  same as #5 ;return number of  #7
['select', 'project', 'select', 'discard', 'project', 'project', 'comparative', 'aggregate']