context: There is a better than even chance that Brian is green. There is a very good chance that Greg is a frog. It is highly unlikely that Sandra left the apple. We doubt that if Brian is green, and Greg is a frog, then Fred is in the bedroom. Chances are about even that if Brian is green, and Sandra left the apple, then Mary went to the kitchen. It is improbable that if Brian is green, and Greg is a frog, then Lily is white.
hypothesis: It is improbable that either Lily is white, or Brian is green.
valid_hypothesis: There is a better than even chance that either Lily is white, or Brian is green.
invalid_hypothesis: It is improbable that either Lily is white, or Brian is green.
hypothesis_assertion: Either Lily is white, or Brian is green.