It is likely that Brian is a lion. It is highly unlikely that John went to the hallway. Chances are slight that Mary moved to the office. There is little chance that if Brian is a lion, and Mary moved to the office, then Yann is tired. It is improbable that if Mary moved to the office, and Brian is a lion, then Julius is a swan. Chances are about even that if Brian is a lion, and Mary moved to the office, then Bernhard is gray.
It is highly unlikely that either Bernhard is gray, or Yann is tired.
It is highly unlikely that either Bernhard is gray, or Yann is tired.
There is a very good chance that either Bernhard is gray, or Yann is tired.
Either Bernhard is gray, or Yann is tired.