There is a very good chance that Bill dropped the milk. It is unlikely that Mary left the apple. It is certain that Bernhard is a frog. It is almost certain that if either Bill dropped the milk, or Bernhard is a frog, then Lily is a rhino. There is a better than even chance that if either Bernhard is a frog, or Mary left the apple, then Brian is white. It is certain that if Bernhard is a frog, and Bill dropped the milk, then Julius is a swan.
It is likely that either Mary left the apple, or Bill dropped the milk.
It is likely that either Mary left the apple, or Bill dropped the milk.
It is improbable that either Mary left the apple, or Bill dropped the milk.
Either Mary left the apple, or Bill dropped the milk.