It is probably not the case that John left the milk. It is likely that Lily is a frog. We doubt that Greg is gray. It is highly unlikely that if Greg is gray, and Lily is a frog, then Mary dropped the apple. There is a better than even chance that if either John left the milk, or Lily is a frog, then Bernhard is white. There is little chance that if either Greg is gray, or Lily is a frog, then Brian is a lion.
We believe that mary dropped the apple, or Bernhard is white.
It is probably not the case that mary dropped the apple, or Bernhard is white.
We believe that mary dropped the apple, or Bernhard is white.
Mary dropped the apple, or Bernhard is white.