context: Chances are about even that Mary went to the office. There is almost no chance that Brian is a swan. There is a better than even chance that Bernhard is gray. It is probably the case that if Brian is a swan, and Bernhard is gray, then Greg is a lion. It is probably not the case that if either Brian is a swan, or Mary went to the office, then Lily is a frog. It is highly unlikely that if either Bernhard is gray, or Brian is a swan, then Julius is gray.
hypothesis: It is impossible that bernhard is gray, and Greg is a lion.
valid_hypothesis: It is impossible that bernhard is gray, and Greg is a lion.
invalid_hypothesis: We believe that bernhard is gray, and Greg is a lion.
hypothesis_assertion: Bernhard is gray, and Greg is a lion.