If three towels are hanging on the wall above a white tub.
return towels ;return wall ;return tub ;return #3 that is white ;return #2 that is above #4 ;return #1 that are hanging on #5 ;return number of  #6 ;return if  #7 is equal to  three
['select', 'select', 'select', 'filter', 'filter', 'filter', 'aggregate', 'boolean']