If each image contains only one wolf, and all images include snowy backdrops.
return wolves ;return images ;return number of  #1 for each  #2 ;return #2 where  #3 is equal to  one ;return number of  #2 ;return number of  #4 ;return if  #5 is equal to  #6 ;return backdrops ;return #8 that are snowy ;return #2 that include #9 ;return number of  #10 ;return if  #5 is equal to  #11 ;return if  both  #7 and #12 are true
['select', 'select', 'group', 'comparative', 'aggregate', 'aggregate', 'boolean', 'select', 'filter', 'filter', 'aggregate', 'boolean', 'boolean']