If two parrots are perched on the same branch, and at least two parrots are perched on separate branches.
return parrots ;return branches ;return #2 that #1 perched on ;return #1 where  #3 are the  same ;return #1 besides  #4 ;return number of  #4 ;return number of  #5 ;return if  #6 is equal to  two  ;return if  #7 is at least two  ;return if  both  #8 and #9 are true
['select', 'select', 'filter', 'comparative', 'discard', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']