context: We doubt that Bernhard is a swan. It is certain that Mary dropped the milk. It is highly unlikely that Greg is a rhino. We doubt that if Bernhard is a swan, and Greg is a rhino, then Sandra left the apple. It is impossible that if Bernhard is a swan, or Greg is a rhino, then Brian is a lion. There is a very good chance that if Greg is a rhino, and Bernhard is a swan, then Julius is white.
hypothesis: It is impossible that either Brian is a lion, or Julius is white.
valid_hypothesis: It is impossible that either Brian is a lion, or Julius is white.
invalid_hypothesis: It is probable that either Brian is a lion, or Julius is white.
hypothesis_assertion: Either Brian is a lion, or Julius is white.