context: It is likely that Brian is a rhino. It is impossible that Mary dropped the milk. It is probable that Greg is a swan.
hypothesis: It is almost certain that either Brian is a rhino, or Greg is a swan.
valid_hypothesis: Chances are about even that either Brian is a rhino, or Greg is a swan.
invalid_hypothesis: It is almost certain that either Brian is a rhino, or Greg is a swan.
hypothesis_assertion: Either Brian is a rhino, or Greg is a swan.