If in at least one image there is a dead elk will all four if its legs in front of a cheetah.
return elk ;return #1 that is dead ;return legs of #2 ;return cheetah ;return #3 that are in  front of #4 ;return images ;return number of  #5 for each  #6 ;return #6 where  #7 is equal to  four ;return number of  #8 ;return if  #9 is at least one
['select', 'filter', 'project', 'select', 'filter', 'select', 'group', 'comparative', 'aggregate', 'boolean']