It is almost certain that Mary went to the bedroom. It is probably the case that Sandra left the milk. We believe that Bernhard is a lion. Chances are about even that if either Bernhard is a lion, or Mary went to the bedroom, then Greg is a frog. It is unlikely that if Mary went to the bedroom, and Bernhard is a lion, then Brian is white. It is almost certain that if Sandra left the milk, or Mary went to the bedroom, then Julius is gray.
It is certain that either Mary went to the bedroom, or Sandra left the milk.
It is probably not the case that either Mary went to the bedroom, or Sandra left the milk.
It is certain that either Mary went to the bedroom, or Sandra left the milk.
Either Mary went to the bedroom, or Sandra left the milk.