If one image shows bookcases lining the left and right walls, with a floor between.
return bookcases ;return the  left wall ;return the  right wall ;return #1 lining #2 ;return #1 lining #3 ;return floor ;return #6 that is  between both  of  #4 and #5 ;return #4 ,   #5 ;return If both  #7 and #8 are  in  one image
['select', 'select', 'select', 'filter', 'filter', 'select', 'intersection', 'union', 'boolean']