context: It is improbable that Bernhard is yellow. It is highly likely that Greg is green. There is a better than even chance that Lily is a swan. There is a very good chance that if either Lily is a swan, or Bernhard is yellow, then Mary went to the bedroom. We doubt that if Bernhard is yellow, or Greg is green, then Bill left the milk. It is probably not the case that if Bernhard is yellow, or Lily is a swan, then Brian is gray.
hypothesis: It is certain that mary went to the bedroom, and Lily is a swan.
valid_hypothesis: Chances are about even that mary went to the bedroom, and Lily is a swan.
invalid_hypothesis: It is certain that mary went to the bedroom, and Lily is a swan.
hypothesis_assertion: Mary went to the bedroom, and Lily is a swan.