If each image contains exactly two dogs, and one image features matching black-and-white dogs reclining on grass.
return dogs ;return grass ;return #1 reclining on #2 ;return #3 that are black-and-white ;return #4 that are matching ;return if  #5 are in  one image  ;return images of #1 ;return number of  #1 for each  #7 ;return #7 where  #8 is equal to  two ;return number of  #9 ;return images ;return number of  #11 ;return if  #10 is equal to  #12 ;return if  both  #6 and #13 are true
['select', 'select', 'filter', 'filter', 'filter', 'boolean', 'project', 'group', 'comparative', 'aggregate', 'select', 'aggregate', 'boolean', 'boolean']