Are there any equal number of objects to the left and right of the tan cylinder?
return objects ;return tan cylinder ;return #1 to  the  left of #2 ;return #1 to  the  right of #2 ;return number of  #3 ;return number of  #3 ;return is  #5 the  same as #6
['select', 'select', 'filter', 'filter', 'aggregate', 'aggregate', 'boolean']