It is probable that John left the apple. It is unlikely that Greg is a swan. It is certain that Bernhard is a frog. We believe that if either Bernhard is a frog, or Greg is a swan, then Daniel dropped the apple. Chances are slight that if Greg is a swan, or Bernhard is a frog, then Brian is white. It is highly unlikely that if Bernhard is a frog, and Greg is a swan, then Julius is white.
We doubt that brian is white, or John left the apple.
We believe that brian is white, or John left the apple.
We doubt that brian is white, or John left the apple.
Brian is white, or John left the apple.