context: It is impossible that Bill went to the office. It is probably not the case that Greg is yellow. It is improbable that Sandra dropped the apple. It is impossible that if either Greg is yellow, or Bill went to the office, then John got the milk. We believe that if Sandra dropped the apple, or Bill went to the office, then Brian is a rhino. It is unlikely that if Sandra dropped the apple, and Greg is yellow, then Bernhard is a swan.
hypothesis: Chances are slight that bernhard is a swan, or Sandra dropped the apple.
valid_hypothesis: Chances are slight that bernhard is a swan, or Sandra dropped the apple.
invalid_hypothesis: There is a better than even chance that bernhard is a swan, or Sandra dropped the apple.
hypothesis_assertion: Bernhard is a swan, or Sandra dropped the apple.