If at least one beverage vending machine has a blue 'wet look' front.
return beverage vending machines ;return fronts of #1 ;return #1 where  #2 are blue ;return #1 where  #2 have a  'wet look ;return #1 in  both  #3 and #4 ;return number of  #5 ;return if  #6 is at least one
['select', 'project', 'comparative', 'comparative', 'intersection', 'aggregate', 'boolean']