If each image contains exactly one small dog.
return dogs ;return #1 that are  small ;return images of  #2 ;return number of #2 for each #3 ;return #3 where #4 is  equal to one ;return number of #5 ;return number of #3 ;return If #6 is  equal to #7
['select', 'filter', 'project', 'group', 'comparative', 'aggregate', 'aggregate', 'boolean']