Are any two small spheres the same color and material?
return spheres ;return #1 that are small ;return colors of #2 ;return materials of #2 ;return #2 where #3 are the  same ;return #2 where #4 are the  same ;return #2 in  both #5 and  #6 ;return number of  #7 ;return if #8 is at least two
['select', 'filter', 'project', 'project', 'comparative', 'comparative', 'intersection', 'aggregate', 'boolean']