context: It is probable that John dropped the apple. There is a better than even chance that Brian is gray. It is certain that Greg is a rhino. There is a very good chance that if John dropped the apple, and Greg is a rhino, then Fred moved to the office. It is likely that if Brian is gray, or Greg is a rhino, then Bernhard is gray. It is almost certain that if either Brian is gray, or Greg is a rhino, then Bill went to the bedroom.
hypothesis: Chances are about even that either Brian is gray, or Bernhard is gray.
valid_hypothesis: Chances are about even that either Brian is gray, or Bernhard is gray.
invalid_hypothesis: It is almost certain that either Brian is gray, or Bernhard is gray.
hypothesis_assertion: Either Brian is gray, or Bernhard is gray.