If one of the images is of a single test tube that is empty.
return images ;return test tubes in  #1 ;return #2 that are empty ;return number of  #3 for each  #1 ;return #1 where  #4 is equal to  one ;return number of  #5 ;return if  #6 is equal to  one
['select', 'project', 'filter', 'group', 'comparative', 'aggregate', 'boolean']