context: It is highly unlikely that Greg is yellow. We believe that Brian is a rhino. There is little chance that Mary dropped the milk. There is a better than even chance that if Brian is a rhino, or Mary dropped the milk, then Lily is a swan. It is probable that if either Greg is yellow, or Mary dropped the milk, then John went to the bedroom. It is probably not the case that if either Brian is a rhino, or Greg is yellow, then Julie is in the kitchen.
hypothesis: We believe that mary dropped the milk, or Brian is a rhino.
valid_hypothesis: We believe that mary dropped the milk, or Brian is a rhino.
invalid_hypothesis: We doubt that mary dropped the milk, or Brian is a rhino.
hypothesis_assertion: Mary dropped the milk, or Brian is a rhino.