context: We doubt that Bernhard is gray. It is almost certain that Mary moved to the garden. There is a very good chance that Julius is white. It is likely that if Julius is white, and Mary moved to the garden, then Brian is a swan. There is a better than even chance that if either Mary moved to the garden, or Julius is white, then Lily is green. Chances are about even that if Julius is white, or Mary moved to the garden, then Daniel put down the milk.
hypothesis: It is highly unlikely that either Mary moved to the garden, or Brian is a swan.
valid_hypothesis: Chances are about even that either Mary moved to the garden, or Brian is a swan.
invalid_hypothesis: It is highly unlikely that either Mary moved to the garden, or Brian is a swan.
hypothesis_assertion: Either Mary moved to the garden, or Brian is a swan.