context: It is improbable that Daniel left the apple. We doubt that Greg is a swan. It is almost certain that Brian is gray. Chances are about even that if Daniel left the apple, or Greg is a swan, then John got the milk. There is little chance that if Daniel left the apple, and Greg is a swan, then Lily is a frog. It is likely that if either Daniel left the apple, or Brian is gray, then Bill went to the bedroom.
hypothesis: There is a better than even chance that greg is a swan, and Lily is a frog.
valid_hypothesis: It is impossible that greg is a swan, and Lily is a frog.
invalid_hypothesis: There is a better than even chance that greg is a swan, and Lily is a frog.
hypothesis_assertion: Greg is a swan, and Lily is a frog.