We doubt that Greg is white. We believe that Jeff went to the kitchen. It is highly likely that Brian is a frog. It is probably not the case that if Brian is a frog, and Jeff went to the kitchen, then Julius is white. It is probably not the case that if Brian is a frog, or Greg is white, then Sandra dropped the milk. There is a better than even chance that if Jeff went to the kitchen, and Greg is white, then John moved to the garden.
It is highly unlikely that either Jeff went to the kitchen, or John moved to the garden.
It is likely that either Jeff went to the kitchen, or John moved to the garden.
It is highly unlikely that either Jeff went to the kitchen, or John moved to the garden.
Either Jeff went to the kitchen, or John moved to the garden.