Chances are about even that Lily is yellow. Chances are about even that Brian is a swan. It is probable that Bill dropped the milk. There is little chance that if Brian is a swan, or Bill dropped the milk, then Greg is green. It is probably not the case that if Brian is a swan, or Bill dropped the milk, then Mary went to the kitchen. There is a very good chance that if Brian is a swan, or Lily is yellow, then Sandra left the apple.
There is a better than even chance that either Greg is green, or Bill dropped the milk.
There is a better than even chance that either Greg is green, or Bill dropped the milk.
It is highly unlikely that either Greg is green, or Bill dropped the milk.
Either Greg is green, or Bill dropped the milk.