If only one image is of a dog with no people present.
return dog ;return images of #1 ;return people in  #2 ;return number of  #3 for each  #2 ;return #2 where  #4 is equal to  zero ;return number of  #5 ;return if  #6 is equal to  one
['select', 'project', 'project', 'group', 'comparative', 'aggregate', 'boolean']