context: It is almost certain that Yann is thirsty. There is little chance that Greg is gray. It is probable that Mary left the apple. It is highly unlikely that if Greg is gray, or Mary left the apple, then Gertrude is a cat. There is a very good chance that if Greg is gray, and Mary left the apple, then Lily is a lion. We doubt that if Mary left the apple, and Greg is gray, then John went to the hallway.
hypothesis: There is a better than even chance that john went to the hallway, and Gertrude is a cat.
valid_hypothesis: It is impossible that john went to the hallway, and Gertrude is a cat.
invalid_hypothesis: There is a better than even chance that john went to the hallway, and Gertrude is a cat.
hypothesis_assertion: John went to the hallway, and Gertrude is a cat.