If one image includes leftward-facing adult and young elephants.
return elephants ;return #1 that are leftward-facing ;return #2 that are adults ;return #2 that are young ;return images of #3 ;return images of #4 ;return images ;return #7 in  both  #5 and #6 ;return number of  #8 ;return if  #9 is equal to  one
['select', 'filter', 'filter', 'filter', 'project', 'project', 'select', 'intersection', 'aggregate', 'boolean']