context: There is a very good chance that Mary got the milk. Chances are about even that Brian is a swan. It is probably not the case that Lily is yellow. It is highly unlikely that if Mary got the milk, and Brian is a swan, then John picked up the apple. There is almost no chance that if Lily is yellow, or Mary got the milk, then Bill went to the bedroom. It is probably not the case that if either Lily is yellow, or Mary got the milk, then Gertrude is a mouse.
hypothesis: It is likely that bill went to the bedroom, and Brian is a swan.
valid_hypothesis: It is impossible that bill went to the bedroom, and Brian is a swan.
invalid_hypothesis: It is likely that bill went to the bedroom, and Brian is a swan.
hypothesis_assertion: Bill went to the bedroom, and Brian is a swan.