It is unlikely that John took the apple. It is probably not the case that Bernhard is a frog. We believe that Fred is in the bedroom. It is unlikely that if Fred is in the bedroom, or John took the apple, then Bill left the milk. There is a better than even chance that if John took the apple, or Bernhard is a frog, then Brian is green. Chances are slight that if John took the apple, and Bernhard is a frog, then Winona is a wolf.
We doubt that either Brian is green, or John took the apple.
We doubt that either Brian is green, or John took the apple.
It is likely that either Brian is green, or John took the apple.
Either Brian is green, or John took the apple.