There is a better than even chance that Lily is a rhino. Chances are slight that Mary went to the garden. We doubt that Daniel took the football. There is a better than even chance that if Lily is a rhino, or Mary went to the garden, then Julius is a lion. It is impossible that if either Mary went to the garden, or Lily is a rhino, then Fred moved to the office. Chances are about even that if Lily is a rhino, or Daniel took the football, then Brian is gray.
It is probably not the case that either Brian is gray, or Fred moved to the office.
It is probably not the case that either Brian is gray, or Fred moved to the office.
There is a very good chance that either Brian is gray, or Fred moved to the office.
Either Brian is gray, or Fred moved to the office.