It is improbable that Mary dropped the milk. There is little chance that Bernhard is a frog. We believe that Bill moved to the office. It is probably not the case that if Bernhard is a frog, and Bill moved to the office, then Daniel left the football. It is probably not the case that if either Bill moved to the office, or Bernhard is a frog, then Julius is a rhino. Chances are about even that if either Mary dropped the milk, or Bill moved to the office, then John grabbed the milk.
We doubt that either Daniel left the football, or Bill moved to the office.
We believe that either Daniel left the football, or Bill moved to the office.
We doubt that either Daniel left the football, or Bill moved to the office.
Either Daniel left the football, or Bill moved to the office.