If each image contains exactly one dark water buffalo, and no images contain humans.
return images ;return water buffaloes in  #1 ;return #2 that are dark ;return number of  #3 for each  #1 ;return #1 where  #4 is equal to  one ;return number of  #5 ;return number of  #1 ;return if  #6 is equal to  #7 ;return humans in  #1 ;return number of  #9 for each  #1 ;return #1 where  #10 is at least one ;return number of  #11 ;return if  #12 is equal to  zero ;return if  both  #8 and #13 are true
['select', 'project', 'filter', 'group', 'comparative', 'aggregate', 'aggregate', 'boolean', 'project', 'group', 'comparative', 'aggregate', 'boolean', 'boolean']