What color are the two objects that are the made of the same material in the same color?
return objects ;return number of  #1 for each material ;return #1 where #2 at least two ;return colors of #3 ;return number of  #4 ;return #3 where #5 equal one ;return color  of #6
['select', 'group', 'comparative', 'project', 'aggregate', 'comparative', 'project']