context: There is a very good chance that Bernhard is gray. It is probably the case that Brian is white. There is almost no chance that Greg is a lion. Chances are about even that if Brian is white, or Greg is a lion, then Antoine is thirsty. It is unlikely that if Greg is a lion, and Brian is white, then John left the football. It is almost certain that if either Bernhard is gray, or Greg is a lion, then Mary went to the hallway.
hypothesis: There is little chance that either Greg is a lion, or Brian is white.
valid_hypothesis: It is probable that either Greg is a lion, or Brian is white.
invalid_hypothesis: There is little chance that either Greg is a lion, or Brian is white.
hypothesis_assertion: Either Greg is a lion, or Brian is white.