It is probably the case that Lily is a swan. It is probably not the case that Winona is a mouse. It is likely that Julius is a rhino. We doubt that if Winona is a mouse, or Lily is a swan, then John got the milk. Chances are slight that if either Lily is a swan, or Winona is a mouse, then Fred is in the bedroom. We believe that if either Lily is a swan, or Julius is a rhino, then Mary went to the office.
It is almost certain that either Mary went to the office, or John got the milk.
Chances are about even that either Mary went to the office, or John got the milk.
It is almost certain that either Mary went to the office, or John got the milk.
Either Mary went to the office, or John got the milk.