Is the object in the back the same color or size as the one in the front?
return objects ;return #1 in the   back ;return #1 in the   front ;return size of #2 ;return size of #3 ;return color of #2 ;return color of #3 ;return if  #4 and #5 are the   same ;return if  #6 and #7 are the   same ;return #8 or  #9
['select', 'filter', 'filter', 'project', 'project', 'project', 'project', 'boolean', 'boolean', 'union']