context: It is probably not the case that Bill went to the hallway. It is certain that Brian is a swan. It is almost certain that Greg is a rhino.
hypothesis: We believe that either Brian is a swan, or Bill went to the hallway.
valid_hypothesis: We believe that either Brian is a swan, or Bill went to the hallway.
invalid_hypothesis: It is unlikely that either Brian is a swan, or Bill went to the hallway.
hypothesis_assertion: Either Brian is a swan, or Bill went to the hallway.