If all of the gorillas are holding food in their left hand.
return gorillas ;return food ;return hand of #1 ;return #3 that is left ;return #1 holding #2 in  #4 ;return the  number of  #1 ;return the  number of  #5 ;return if  #6 is equal to  #7
['select', 'select', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'boolean']