context: There is a very good chance that Lily is white. It is likely that Brian is a frog. We doubt that Bill went to the kitchen. It is probably the case that if Lily is white, or Bill went to the kitchen, then Fred moved to the office. There is a better than even chance that if Lily is white, or Brian is a frog, then Greg is gray. It is certain that if either Bill went to the kitchen, or Lily is white, then Daniel grabbed the milk.
hypothesis: It is almost certain that fred moved to the office, and Brian is a frog.
valid_hypothesis: Chances are about even that fred moved to the office, and Brian is a frog.
invalid_hypothesis: It is almost certain that fred moved to the office, and Brian is a frog.
hypothesis_assertion: Fred moved to the office, and Brian is a frog.