context: It is impossible that Brian is a rhino. It is certain that John went to the hallway. It is probably not the case that Sandra got the football. There is little chance that if Sandra got the football, and Brian is a rhino, then Fred discarded the milk. It is probable that if either Sandra got the football, or Brian is a rhino, then Lily is gray. It is probably the case that if Brian is a rhino, and Sandra got the football, then Bill moved to the office.
hypothesis: It is probably not the case that either Fred discarded the milk, or Sandra got the football.
valid_hypothesis: It is probably not the case that either Fred discarded the milk, or Sandra got the football.
invalid_hypothesis: It is certain that either Fred discarded the milk, or Sandra got the football.
hypothesis_assertion: Either Fred discarded the milk, or Sandra got the football.