context: It is probable that Julius is a swan. It is probably not the case that Mary grabbed the milk. Chances are slight that Brian is yellow.
hypothesis: There is a very good chance that mary grabbed the milk, and Brian is yellow.
valid_hypothesis: There is almost no chance that mary grabbed the milk, and Brian is yellow.
invalid_hypothesis: There is a very good chance that mary grabbed the milk, and Brian is yellow.
hypothesis_assertion: Mary grabbed the milk, and Brian is yellow.