context: Chances are about even that Brian is a lion. It is certain that Emily is a cat. We believe that Mary went to the kitchen. It is probably not the case that if Brian is a lion, or Mary went to the kitchen, then Lily is a swan. We believe that if Mary went to the kitchen, or Brian is a lion, then Daniel took the milk. There is a very good chance that if either Brian is a lion, or Mary went to the kitchen, then John moved to the office.
hypothesis: It is highly unlikely that either John moved to the office, or Brian is a lion.
valid_hypothesis: It is probable that either John moved to the office, or Brian is a lion.
invalid_hypothesis: It is highly unlikely that either John moved to the office, or Brian is a lion.
hypothesis_assertion: Either John moved to the office, or Brian is a lion.