If there is no less than one black convertible car with its top down
return cars ;return #1 that are convertible ;return #2 that are black ;return top of #3 ;return #3 where  #4 is down ;return number of  #5 ;return if  #6 is at least one
['select', 'filter', 'filter', 'project', 'comparative', 'aggregate', 'boolean']