If all of the staircases have vertical banisters for support.
return staircases ;return banisters of #1 ;return #2 that are vertical ;return #3 that are for each  support ;return number of  #4 for each  #1 ;return #1 where  #5 is at least one ;return number of  #1 ;return number of  #6 ;return if  #7 is equal to  #8
['select', 'project', 'filter', 'group', 'group', 'comparative', 'aggregate', 'aggregate', 'boolean']