context: It is probably not the case that Brian is green. It is highly unlikely that Sandra took the milk. It is improbable that Lily is a lion. There is a very good chance that if Sandra took the milk, and Lily is a lion, then Bernhard is a swan. We doubt that if Sandra took the milk, and Lily is a lion, then Yann is thirsty. It is almost certain that if Brian is green, or Sandra took the milk, then Greg is gray.
hypothesis: It is impossible that lily is a lion, and Sandra took the milk.
valid_hypothesis: It is impossible that lily is a lion, and Sandra took the milk.
invalid_hypothesis: There is a very good chance that lily is a lion, and Sandra took the milk.
hypothesis_assertion: Lily is a lion, and Sandra took the milk.