If exactly two parrots are sitting on tree branches, both of them having at least some green on their bodies, but only one with a blue head.
return parrots ;return tree branches ;return #1 sitting on #2 ;return body of #3 ;return #3 where  #4 has at least some green ;return head of #5 ;return #5 where  #6 is blue ;return number of  #5 ;return number of  #7 ;return if  #8 is equal to  two ;return if  #9 is equal to  one ;return if  both  #10 and #11 are true
['select', 'select', 'filter', 'project', 'comparative', 'project', 'comparative', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']