context: It is certain that Bernhard is a swan. There is a very good chance that Brian is white. It is probably not the case that Antoine is tired.
hypothesis: We doubt that either Bernhard is a swan, or Brian is white.
valid_hypothesis: We doubt that either Bernhard is a swan, or Brian is white.
invalid_hypothesis: It is certain that either Bernhard is a swan, or Brian is white.
hypothesis_assertion: Either Bernhard is a swan, or Brian is white.