There is little chance that Bernhard is a swan. It is probable that Fred went to the kitchen. There is a very good chance that Julius is white. Chances are about even that if Julius is white, and Bernhard is a swan, then John discarded the apple. It is unlikely that if Fred went to the kitchen, or Bernhard is a swan, then Greg is a frog. It is highly unlikely that if Julius is white, and Fred went to the kitchen, then Brian is yellow.
It is impossible that either John discarded the apple, or Fred went to the kitchen.
It is probably the case that either John discarded the apple, or Fred went to the kitchen.
It is impossible that either John discarded the apple, or Fred went to the kitchen.
Either John discarded the apple, or Fred went to the kitchen.