If four dogs are in the grass, and one has a red ball in its mouth.
return dogs ;return the  grass ;return #1 in  #2 ;return mouth of #3 ;return ball ;return #5 that is red ;return #3 where  #4 has #6 in  ;return number of  #3 ;return number of  #7 ;return if  #8 is equal to  four ;return if  #9 is equal to  one ;return if  both  #10 and #11 are true
['select', 'select', 'filter', 'project', 'select', 'filter', 'comparative', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']