context: It is improbable that Greg is gray. There is a very good chance that Mary got the milk. Chances are about even that Bill went to the hallway. There is a better than even chance that if either Mary got the milk, or Greg is gray, then Bernhard is a rhino. It is unlikely that if Greg is gray, or Bill went to the hallway, then Jessica is a wolf. We doubt that if either Mary got the milk, or Bill went to the hallway, then Brian is white.
hypothesis: It is impossible that bernhard is a rhino, or Greg is gray.
valid_hypothesis: Chances are about even that bernhard is a rhino, or Greg is gray.
invalid_hypothesis: It is impossible that bernhard is a rhino, or Greg is gray.
hypothesis_assertion: Bernhard is a rhino, or Greg is gray.