context: Chances are about even that Lily is green. It is highly likely that Bill is in the school. It is highly unlikely that Julius is white. It is probably the case that if Julius is white, and Lily is green, then John grabbed the milk. It is probably the case that if either Julius is white, or Lily is green, then Fred went to the hallway. There is a very good chance that if either Bill is in the school, or Lily is green, then Brian is yellow.
hypothesis: It is impossible that john grabbed the milk, or Brian is yellow.
valid_hypothesis: Chances are about even that john grabbed the milk, or Brian is yellow.
invalid_hypothesis: It is impossible that john grabbed the milk, or Brian is yellow.
hypothesis_assertion: John grabbed the milk, or Brian is yellow.