It is impossible that John picked up the apple. It is almost certain that Brian is gray. It is unlikely that Julius is a swan. We doubt that if John picked up the apple, and Brian is gray, then Greg is a frog. It is unlikely that if Julius is a swan, or Brian is gray, then Winona is a cat. We doubt that if Brian is gray, or Julius is a swan, then Mary dropped the milk.
It is probable that mary dropped the milk, or John picked up the apple.
It is unlikely that mary dropped the milk, or John picked up the apple.
It is probable that mary dropped the milk, or John picked up the apple.
Mary dropped the milk, or John picked up the apple.