context: It is certain that Brian is gray. It is improbable that Mary picked up the apple. There is a very good chance that Jessica is a mouse. It is unlikely that if Mary picked up the apple, or Jessica is a mouse, then Sandra took the milk. Chances are about even that if either Brian is gray, or Mary picked up the apple, then Lily is a frog. Chances are about even that if either Mary picked up the apple, or Jessica is a mouse, then Bill went to the hallway.
hypothesis: Chances are about even that lily is a frog, and Brian is gray.
valid_hypothesis: Chances are about even that lily is a frog, and Brian is gray.
invalid_hypothesis: It is impossible that lily is a frog, and Brian is gray.
hypothesis_assertion: Lily is a frog, and Brian is gray.