It is impossible that John went to the office. It is probably the case that Bill is in the school. Chances are slight that Brian is a lion.
It is improbable that either Brian is a lion, or Bill is in the school.
It is probable that either Brian is a lion, or Bill is in the school.
It is improbable that either Brian is a lion, or Bill is in the school.
Either Brian is a lion, or Bill is in the school.