We believe that Bernhard is a rhino. It is probably not the case that Mary put down the apple. It is almost certain that John picked up the milk.
It is certain that bernhard is a rhino, or John picked up the milk.
It is certain that bernhard is a rhino, or John picked up the milk.
It is impossible that bernhard is a rhino, or John picked up the milk.
Bernhard is a rhino, or John picked up the milk.