If each image contains exactly one monkey, and the monkeys on the right and left are the same approximate age [mature or immature].
return monkeys ;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 #1 that are on the  right ;return #2 that are on the  left ;return approximate age of #8 ;return approximate age of #9 ;return if  #10 is the  same as #11 ;return if  both  #7 and #12 are true
['select', 'select', 'group', 'comparative', 'aggregate', 'aggregate', 'boolean', 'filter', 'filter', 'project', 'project', 'boolean', 'boolean']