context: It is highly unlikely that Bernhard is white. We believe that Fred dropped the apple. It is improbable that Sandra left the football. It is unlikely that if Fred dropped the apple, or Sandra left the football, then Bill went to the hallway. We doubt that if Sandra left the football, and Bernhard is white, then Julius is a swan. It is improbable that if either Sandra left the football, or Fred dropped the apple, then Greg is a frog.
hypothesis: It is impossible that either Julius is a swan, or Fred dropped the apple.
valid_hypothesis: We believe that either Julius is a swan, or Fred dropped the apple.
invalid_hypothesis: It is impossible that either Julius is a swan, or Fred dropped the apple.
hypothesis_assertion: Either Julius is a swan, or Fred dropped the apple.