It is highly unlikely that Greg is gray. We doubt that Julius is a rhino. We doubt that Brian is green. Chances are about even that if Brian is green, or Greg is gray, then Bernhard is a swan. It is probable that if either Greg is gray, or Julius is a rhino, then Mary moved to the garden. It is highly likely that if Greg is gray, or Julius is a rhino, then Daniel dropped the apple.
It is probably the case that greg is gray, or Mary moved to the garden.
We doubt that greg is gray, or Mary moved to the garden.
It is probably the case that greg is gray, or Mary moved to the garden.
Greg is gray, or Mary moved to the garden.