context: It is probably not the case that Brian is green. It is improbable that Lily is a rhino. It is probably not the case that Bill went to the bedroom. Chances are about even that if Lily is a rhino, and Bill went to the bedroom, then Mary dropped the milk. Chances are about even that if Brian is green, and Bill went to the bedroom, then John picked up the apple. Chances are slight that if either Brian is green, or Bill went to the bedroom, then Julius is a swan.
hypothesis: There is a very good chance that brian is green, or Julius is a swan.
valid_hypothesis: It is probably not the case that brian is green, or Julius is a swan.
invalid_hypothesis: There is a very good chance that brian is green, or Julius is a swan.
hypothesis_assertion: Brian is green, or Julius is a swan.