context: It is unlikely that Lily is white. It is certain that Brian is a rhino. We believe that John took the apple. Chances are about even that if Brian is a rhino, or John took the apple, then Mary went to the bedroom. It is unlikely that if either Lily is white, or Brian is a rhino, then Gertrude is a mouse. There is a very good chance that if Brian is a rhino, or John took the apple, then Greg is yellow.
hypothesis: It is almost certain that either Brian is a rhino, or Greg is yellow.
valid_hypothesis: It is unlikely that either Brian is a rhino, or Greg is yellow.
invalid_hypothesis: It is almost certain that either Brian is a rhino, or Greg is yellow.
hypothesis_assertion: Either Brian is a rhino, or Greg is yellow.