context: It is almost certain that Fred left the football. Chances are about even that Bernhard is a swan. It is improbable that Greg is white. There is a very good chance that if Bernhard is a swan, or Fred left the football, then John went to the bedroom. There is a better than even chance that if Greg is white, or Fred left the football, then Bill moved to the office. It is unlikely that if Fred left the football, and Greg is white, then Brian is gray.
hypothesis: Chances are about even that fred left the football, and Bernhard is a swan.
valid_hypothesis: Chances are about even that fred left the football, and Bernhard is a swan.
invalid_hypothesis: It is highly unlikely that fred left the football, and Bernhard is a swan.
hypothesis_assertion: Fred left the football, and Bernhard is a swan.