If an image features no more than four birds gathered around a carcass.
return birds ;return carcass ;return #1 that are gathered around #2 ;return images ;return number of  #3 for each  #4 ;return #4 where  #5 is at most four ;return number of  #6 ;return if  #7 is at least one
['select', 'select', 'filter', 'select', 'group', 'comparative', 'aggregate', 'boolean']