avoiding something with a yes vapor has a uncertain 60
perfect_vacuum has no_air silence is not condition. yes is not affirmative_statement. uh_uh is not shorthand_way_of_saying_no. yes is not affirmative. yeah is not informal_way_to_say_yes. perfect_vacuum has not no_air yes_no_question is not problem. water_vapor is not vapor. steam is not vapor.