context: It is improbable that John went to the bedroom. We believe that Brian is gray. Chances are slight that Sandra grabbed the milk. It is highly likely that if John went to the bedroom, and Sandra grabbed the milk, then Gertrude is a wolf. It is likely that if either John went to the bedroom, or Sandra grabbed the milk, then Bernhard is a lion. There is a better than even chance that if Brian is gray, and Sandra grabbed the milk, then Julius is a swan.
hypothesis: We believe that julius is a swan, or Bernhard is a lion.
valid_hypothesis: It is improbable that julius is a swan, or Bernhard is a lion.
invalid_hypothesis: We believe that julius is a swan, or Bernhard is a lion.
hypothesis_assertion: Julius is a swan, or Bernhard is a lion.