If one large shelf unit is shown with an optional ladder accessory.
return shelf unit ;return #1 that is large ;return ladder accessory ;return #3 that is optional ;return #2 that is shown with #4 ;return the  number of  #5 ;return if  #6 is equal to  one
['select', 'filter', 'select', 'filter', 'filter', 'aggregate', 'boolean']