context: It is unlikely that Brian is a rhino. We doubt that John left the milk. There is a better than even chance that Greg is green. There is a better than even chance that if either Greg is green, or John left the milk, then Lily is a lion. It is certain that if Brian is a rhino, and Greg is green, then Bernhard is yellow. We believe that if Greg is green, and Brian is a rhino, then Mary went to the office.
hypothesis: It is certain that either Lily is a lion, or Brian is a rhino.
valid_hypothesis: Chances are about even that either Lily is a lion, or Brian is a rhino.
invalid_hypothesis: It is certain that either Lily is a lion, or Brian is a rhino.
hypothesis_assertion: Either Lily is a lion, or Brian is a rhino.