context: Chances are about even that Brian is a swan. Chances are about even that Lily is yellow. It is impossible that Bernhard is gray. Chances are about even that if Lily is yellow, and Bernhard is gray, then Winona is a cat. We doubt that if either Lily is yellow, or Bernhard is gray, then Mary put down the milk. It is highly likely that if Brian is a swan, and Bernhard is gray, then Fred went to the hallway.
hypothesis: It is probable that either Fred went to the hallway, or Winona is a cat.
valid_hypothesis: It is impossible that either Fred went to the hallway, or Winona is a cat.
invalid_hypothesis: It is probable that either Fred went to the hallway, or Winona is a cat.
hypothesis_assertion: Either Fred went to the hallway, or Winona is a cat.