context: It is certain that Lily is a swan. It is highly unlikely that Greg is gray. It is almost certain that John went to the garden. It is highly likely that if either Greg is gray, or Lily is a swan, then Bernhard is white. It is improbable that if either Lily is a swan, or John went to the garden, then Mary got the football. Chances are about even that if either Lily is a swan, or John went to the garden, then Brian is a rhino.
hypothesis: It is probably not the case that either Bernhard is white, or Brian is a rhino.
valid_hypothesis: There is a very good chance that either Bernhard is white, or Brian is a rhino.
invalid_hypothesis: It is probably not the case that either Bernhard is white, or Brian is a rhino.
hypothesis_assertion: Either Bernhard is white, or Brian is a rhino.