It is certain that Fred went to the kitchen. It is almost certain that Mary picked up the milk. We doubt that Greg is a lion. It is likely that if Greg is a lion, or Mary picked up the milk, then Bernhard is yellow. Chances are slight that if Mary picked up the milk, or Fred went to the kitchen, then Lily is a rhino. It is unlikely that if Greg is a lion, or Mary picked up the milk, then Brian is gray.
It is probably not the case that either Fred went to the kitchen, or Bernhard is yellow.
It is probably not the case that either Fred went to the kitchen, or Bernhard is yellow.
It is certain that either Fred went to the kitchen, or Bernhard is yellow.
Either Fred went to the kitchen, or Bernhard is yellow.