context: It is probably not the case that Brian is a rhino. It is likely that John discarded the milk. It is probably not the case that Mary went to the bedroom. There is a very good chance that if Brian is a rhino, and John discarded the milk, then Bernhard is a swan. It is probable that if Mary went to the bedroom, and Brian is a rhino, then Jeff moved to the office. We believe that if Mary went to the bedroom, and Brian is a rhino, then Greg is green.
hypothesis: It is highly likely that either Brian is a rhino, or Greg is green.
valid_hypothesis: We doubt that either Brian is a rhino, or Greg is green.
invalid_hypothesis: It is highly likely that either Brian is a rhino, or Greg is green.
hypothesis_assertion: Either Brian is a rhino, or Greg is green.