If there is 1 pencil case that is fully open displaying pencils and pens.
return pencil cases ;return #1 that are fully open ;return pencils ;return pens ;return #2 that are displaying #3 ;return #2 that are displaying #4 ;return #2 in  both  #5 and #6 ;return number of  #7 ;return if  #8 is equal to  one
['select', 'filter', 'select', 'select', 'filter', 'filter', 'intersection', 'aggregate', 'boolean']