context: It is probably not the case that Brian is gray. It is probably not the case that John took the apple. It is probably not the case that Greg is a swan. It is certain that if Greg is a swan, and Brian is gray, then Lily is yellow. It is impossible that if either Brian is gray, or Greg is a swan, then Mary went to the hallway. There is a better than even chance that if Greg is a swan, or Brian is gray, then Gertrude is a mouse.
hypothesis: Chances are about even that brian is gray, or Greg is a swan.
valid_hypothesis: Chances are about even that brian is gray, or Greg is a swan.
invalid_hypothesis: It is certain that brian is gray, or Greg is a swan.
hypothesis_assertion: Brian is gray, or Greg is a swan.