context: Chances are slight that Bernhard is yellow. It is highly unlikely that Greg is a swan. It is certain that Brian is a rhino. It is highly likely that if Greg is a swan, and Bernhard is yellow, then Gertrude is a mouse. There is a better than even chance that if Brian is a rhino, or Greg is a swan, then John went to the office. There is a very good chance that if Bernhard is yellow, and Brian is a rhino, then Mary dropped the milk.
hypothesis: Chances are about even that either Brian is a rhino, or John went to the office.
valid_hypothesis: Chances are about even that either Brian is a rhino, or John went to the office.
invalid_hypothesis: It is almost certain that either Brian is a rhino, or John went to the office.
hypothesis_assertion: Either Brian is a rhino, or John went to the office.