It is probable that Greg is white. Chances are slight that Brian is a swan. It is probably not the case that John went to the office. It is impossible that if either Brian is a swan, or John went to the office, then Julius is green. It is probable that if John went to the office, or Greg is white, then Fred left the milk. There is a better than even chance that if John went to the office, or Brian is a swan, then Mary dropped the apple.
It is unlikely that either Julius is green, or Greg is white.
It is probable that either Julius is green, or Greg is white.
It is unlikely that either Julius is green, or Greg is white.
Either Julius is green, or Greg is white.