context: There is a better than even chance that Brian is a swan. Chances are slight that Mary grabbed the milk. It is unlikely that John moved to the office.
hypothesis: It is highly unlikely that mary grabbed the milk, and Brian is a swan.
valid_hypothesis: It is highly unlikely that mary grabbed the milk, and Brian is a swan.
invalid_hypothesis: It is likely that mary grabbed the milk, and Brian is a swan.
hypothesis_assertion: Mary grabbed the milk, and Brian is a swan.