What material is the small object that is behind the purple metallic object and in front of the gray cylinder?
return the  purple metallic object  ;return the  gray cylinder ;return objects behind of #1 ;return #3 that are in  front of #2 ;return #4 that are small ;return the  material of #5
['select', 'select', 'project', 'filter', 'filter', 'project']