context: It is improbable that Yann is thirsty. We doubt that Fred went to the hallway. It is probable that Brian is a lion. Chances are about even that if either Yann is thirsty, or Fred went to the hallway, then Bernhard is a swan. There is little chance that if either Brian is a lion, or Fred went to the hallway, then John discarded the milk. It is improbable that if Yann is thirsty, and Brian is a lion, then Julius is a frog.
hypothesis: Chances are slight that either Fred went to the hallway, or Brian is a lion.
valid_hypothesis: There is a better than even chance that either Fred went to the hallway, or Brian is a lion.
invalid_hypothesis: Chances are slight that either Fred went to the hallway, or Brian is a lion.
hypothesis_assertion: Either Fred went to the hallway, or Brian is a lion.