It is certain that Greg is gray. It is probably the case that Lily is a lion. There is almost no chance that Brian is green. We believe that if Greg is gray, and Lily is a lion, then Daniel took the milk. It is unlikely that if Greg is gray, or Lily is a lion, then Mary went to the office. It is unlikely that if Lily is a lion, and Greg is gray, then John dropped the apple.
There is almost no chance that either Brian is green, or Daniel took the milk.
Chances are about even that either Brian is green, or Daniel took the milk.
There is almost no chance that either Brian is green, or Daniel took the milk.
Either Brian is green, or Daniel took the milk.