context: It is certain that Brian is a rhino. It is improbable that Bill moved to the garden. It is highly unlikely that Mary went to the hallway. It is improbable that if Brian is a rhino, or Mary went to the hallway, then Sandra grabbed the milk. We doubt that if Brian is a rhino, and Bill moved to the garden, then Emily is a mouse. There is little chance that if either Mary went to the hallway, or Brian is a rhino, then Greg is yellow.
hypothesis: Chances are slight that mary went to the hallway, or Sandra grabbed the milk.
valid_hypothesis: Chances are slight that mary went to the hallway, or Sandra grabbed the milk.
invalid_hypothesis: There is a better than even chance that mary went to the hallway, or Sandra grabbed the milk.
hypothesis_assertion: Mary went to the hallway, or Sandra grabbed the milk.