context: There is a very good chance that Bernhard is gray. There is a very good chance that Mary got the milk. There is almost no chance that Gertrude is a cat. It is highly likely that if Gertrude is a cat, or Bernhard is gray, then Bill went to the bedroom. It is probably the case that if Bernhard is gray, or Mary got the milk, then Greg is a swan. There is a better than even chance that if either Mary got the milk, or Gertrude is a cat, then John dropped the apple.
hypothesis: Chances are about even that either Greg is a swan, or Bill went to the bedroom.
valid_hypothesis: Chances are about even that either Greg is a swan, or Bill went to the bedroom.
invalid_hypothesis: It is impossible that either Greg is a swan, or Bill went to the bedroom.
hypothesis_assertion: Either Greg is a swan, or Bill went to the bedroom.