context: There is a very good chance that Mary moved to the office. Chances are about even that Brian is a swan. We believe that Greg is yellow.
hypothesis: It is impossible that either Greg is yellow, or Brian is a swan.
valid_hypothesis: Chances are about even that either Greg is yellow, or Brian is a swan.
invalid_hypothesis: It is impossible that either Greg is yellow, or Brian is a swan.
hypothesis_assertion: Either Greg is yellow, or Brian is a swan.