context: It is probably not the case that Fred dropped the apple. It is impossible that Daniel grabbed the milk. It is impossible that Brian is gray. We believe that if Daniel grabbed the milk, or Brian is gray, then Mary went to the kitchen. It is unlikely that if Brian is gray, and Daniel grabbed the milk, then Julius is a lion. Chances are about even that if Daniel grabbed the milk, and Fred dropped the apple, then Lily is white.
hypothesis: Chances are about even that julius is a lion, and Fred dropped the apple.
valid_hypothesis: It is impossible that julius is a lion, and Fred dropped the apple.
invalid_hypothesis: Chances are about even that julius is a lion, and Fred dropped the apple.
hypothesis_assertion: Julius is a lion, and Fred dropped the apple.