Is there a small ball and a small cube that are the same color?
return balls ;return #1 that  are small  ;return cubes ;return #3 that  are small  ;return colors of #2 ;return colors of #4 ;return is  any  of #5 same as any of  #6
['select', 'filter', 'select', 'filter', 'project', 'project', 'boolean']