context: It is likely that Bernhard is gray. It is highly unlikely that Greg is a lion. It is probable that Brian is a swan.
hypothesis: Chances are about even that either Bernhard is gray, or Brian is a swan.
valid_hypothesis: Chances are about even that either Bernhard is gray, or Brian is a swan.
invalid_hypothesis: It is impossible that either Bernhard is gray, or Brian is a swan.
hypothesis_assertion: Either Bernhard is gray, or Brian is a swan.