It is probable that Lily is a swan. There is little chance that Greg is gray. It is improbable that Mary dropped the milk. It is likely that if Greg is gray, and Lily is a swan, then Winona is a wolf. It is highly likely that if either Lily is a swan, or Greg is gray, then Sandra grabbed the milk. There is almost no chance that if Greg is gray, or Mary dropped the milk, then John took the apple.
It is impossible that mary dropped the milk, or Sandra grabbed the milk.
There is a better than even chance that mary dropped the milk, or Sandra grabbed the milk.
It is impossible that mary dropped the milk, or Sandra grabbed the milk.
Mary dropped the milk, or Sandra grabbed the milk.