There is little chance that Bill went to the hallway. It is highly unlikely that Daniel left the milk. It is probable that Brian is a swan.
It is probably not the case that brian is a swan, or Bill went to the hallway.
We believe that brian is a swan, or Bill went to the hallway.
It is probably not the case that brian is a swan, or Bill went to the hallway.
Brian is a swan, or Bill went to the hallway.