It is improbable that Brian is gray. Chances are about even that Julius is a frog. It is probably the case that Mary left the apple. It is certain that if Julius is a frog, and Brian is gray, then Fred moved to the office. We believe that if either Julius is a frog, or Brian is gray, then John went to the hallway. It is certain that if Julius is a frog, and Brian is gray, then Greg is a swan.
It is certain that brian is gray, or John went to the hallway.
Chances are about even that brian is gray, or John went to the hallway.
It is certain that brian is gray, or John went to the hallway.
Brian is gray, or John went to the hallway.