context: Chances are about even that Brian is a lion. It is highly unlikely that Mary got the milk. It is unlikely that Bernhard is white. There is almost no chance that if Bernhard is white, and Brian is a lion, then Fred is in the bedroom. It is probable that if either Brian is a lion, or Mary got the milk, then Julius is white. There is almost no chance that if either Mary got the milk, or Bernhard is white, then Lily is a rhino.
hypothesis: It is highly unlikely that either Lily is a rhino, or Mary got the milk.
valid_hypothesis: It is highly unlikely that either Lily is a rhino, or Mary got the milk.
invalid_hypothesis: We believe that either Lily is a rhino, or Mary got the milk.
hypothesis_assertion: Either Lily is a rhino, or Mary got the milk.