There is almost no chance that Greg is gray. There is a better than even chance that Brian is a swan. It is unlikely that John is in the office.
There is a better than even chance that either Brian is a swan, or John is in the office.
There is a better than even chance that either Brian is a swan, or John is in the office.
There is almost no chance that either Brian is a swan, or John is in the office.
Either Brian is a swan, or John is in the office.