context: It is highly unlikely that Greg is a swan. It is highly unlikely that Fred went to the bedroom. We believe that Sandra left the football.
hypothesis: There is a very good chance that sandra left the football, and Greg is a swan.
valid_hypothesis: It is highly unlikely that sandra left the football, and Greg is a swan.
invalid_hypothesis: There is a very good chance that sandra left the football, and Greg is a swan.
hypothesis_assertion: Sandra left the football, and Greg is a swan.