What material are the objects that are the same color cubes?
return cubes ;return the  colors of #1 ;return objects ;return #3 besides #1 ;return colors of #4 ;return #4 where #5 is  the  same as #2 ;return the  materials of #6
['select', 'project', 'select', 'discard', 'project', 'comparative', 'project']