It is probably not the case that Emily is a mouse. Chances are about even that Brian is gray. It is probably not the case that Lily is a swan. There is little chance that if either Lily is a swan, or Brian is gray, then Bernhard is gray. Chances are slight that if Brian is gray, or Emily is a mouse, then John put down the milk. It is improbable that if either Emily is a mouse, or Lily is a swan, then Mary moved to the office.
It is certain that brian is gray, or Mary moved to the office.
Chances are about even that brian is gray, or Mary moved to the office.
It is certain that brian is gray, or Mary moved to the office.
Brian is gray, or Mary moved to the office.