If 1 vending machine is the traditional closed-face, single image, cover.
return vending machines ;return #1 that are traditional ;return #2 that are closed-face ;return cover of #3 ;return #3 where  #4 is a  single image ;return number of  #5 ;return if  #6 is equal to  one
['select', 'filter', 'filter', 'project', 'comparative', 'aggregate', 'boolean']