context: It is improbable that Bernhard is gray. It is unlikely that Brian is a swan. There is almost no chance that Greg is yellow.
hypothesis: There is a very good chance that either Greg is yellow, or Brian is a swan.
valid_hypothesis: We doubt that either Greg is yellow, or Brian is a swan.
invalid_hypothesis: There is a very good chance that either Greg is yellow, or Brian is a swan.
hypothesis_assertion: Either Greg is yellow, or Brian is a swan.