context: It is highly unlikely that Lily is a rhino. Chances are slight that Brian is a swan. There is a better than even chance that Mary grabbed the milk. There is little chance that if Lily is a rhino, and Brian is a swan, then Fred went to the hallway. There is a better than even chance that if either Brian is a swan, or Mary grabbed the milk, then Bernhard is a frog. It is certain that if either Brian is a swan, or Lily is a rhino, then John discarded the milk.
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.