If all graduates wear dark caps and robes, and the left image shows a smiling black graduate alone in the foreground.
return graduates ;return caps of #1 ;return #1 where  #2 is dark ;return robes of #3 ;return #3 where  #4 is dark ;return number of  #1 ;return number of  #5 ;return if  #6 is equal to  #7 ;return left image ;return foreground of #9 ;return #1 that is in  #10 ;return number of  #11 ;return if  #12 is equal to  one ;return #12 that is black ;return if  #14 is smiling ;return if  both  #13 and #15 are true ;return if  both  #8 and #16 are true
['select', 'project', 'comparative', 'project', 'comparative', 'aggregate', 'aggregate', 'boolean', 'select', 'project', 'filter', 'aggregate', 'boolean', 'filter', 'boolean', 'boolean', 'boolean']