context: Chances are slight that Brian is gray. It is highly likely that Lily is a rhino. It is unlikely that Fred went to the cinema. There is a better than even chance that if Brian is gray, or Fred went to the cinema, then Mary left the milk. There is little chance that if either Brian is gray, or Fred went to the cinema, then Bernhard is white. It is highly likely that if either Brian is gray, or Lily is a rhino, then Daniel put down the milk.
hypothesis: It is impossible that daniel put down the milk, and Brian is gray.
valid_hypothesis: It is impossible that daniel put down the milk, and Brian is gray.
invalid_hypothesis: It is certain that daniel put down the milk, and Brian is gray.
hypothesis_assertion: Daniel put down the milk, and Brian is gray.