context: It is probably not the case that Brian is a swan. It is highly unlikely that Mary went to the hallway. We believe that Greg is yellow.
hypothesis: There is a very good chance that greg is yellow, or Brian is a swan.
valid_hypothesis: There is a very good chance that greg is yellow, or Brian is a swan.
invalid_hypothesis: We doubt that greg is yellow, or Brian is a swan.
hypothesis_assertion: Greg is yellow, or Brian is a swan.