We believe that John dropped the apple. It is improbable that Mary put down the milk. Chances are slight that Bernhard is a swan. It is probably not the case that if Mary put down the milk, and John dropped the apple, then Brian is a lion. It is probably not the case that if Mary put down the milk, or Bernhard is a swan, then Emily is a mouse. Chances are about even that if either John dropped the apple, or Mary put down the milk, then Greg is white.
It is probably not the case that either Emily is a mouse, or Greg is white.
It is probably not the case that either Emily is a mouse, or Greg is white.
It is almost certain that either Emily is a mouse, or Greg is white.
Either Emily is a mouse, or Greg is white.