It is almost certain that Brian is gray. There is a better than even chance that Greg is a rhino. It is highly likely that Mary went to the garden. It is likely that if Brian is gray, or Greg is a rhino, then Bernhard is a swan. We doubt that if Brian is gray, and Mary went to the garden, then John discarded the milk. Chances are about even that if Greg is a rhino, and Mary went to the garden, then Sumit is tired.
It is probably not the case that either Sumit is tired, or Brian is gray.
It is probable that either Sumit is tired, or Brian is gray.
It is probably not the case that either Sumit is tired, or Brian is gray.
Either Sumit is tired, or Brian is gray.