context: We doubt that Bernhard is white. It is highly likely that Greg is a swan. Chances are slight that Sandra left the apple. We doubt that if either Bernhard is white, or Greg is a swan, then Fred is in the office. It is improbable that if Sandra left the apple, and Greg is a swan, then Mary went to the hallway. It is highly unlikely that if Bernhard is white, and Greg is a swan, then Brian is a frog.
hypothesis: It is impossible that either Greg is a swan, or Sandra left the apple.
valid_hypothesis: There is a very good chance that either Greg is a swan, or Sandra left the apple.
invalid_hypothesis: It is impossible that either Greg is a swan, or Sandra left the apple.
hypothesis_assertion: Either Greg is a swan, or Sandra left the apple.