context: It is probable that Julius is a swan. It is impossible that Fred went to the bedroom. It is unlikely that Brian is white.
hypothesis: It is impossible that either Julius is a swan, or Brian is white.
valid_hypothesis: There is a better than even chance that either Julius is a swan, or Brian is white.
invalid_hypothesis: It is impossible that either Julius is a swan, or Brian is white.
hypothesis_assertion: Either Julius is a swan, or Brian is white.