context: It is probably the case that Greg is a swan. There is a better than even chance that Brian is gray. It is unlikely that Sandra grabbed the milk. There is almost no chance that if Brian is gray, or Greg is a swan, then Bernhard is a frog. It is probably not the case that if Sandra grabbed the milk, and Brian is gray, then Mary went to the garden. It is impossible that if either Greg is a swan, or Sandra grabbed the milk, then Julius is gray.
hypothesis: We believe that bernhard is a frog, or Julius is gray.
valid_hypothesis: There is almost no chance that bernhard is a frog, or Julius is gray.
invalid_hypothesis: We believe that bernhard is a frog, or Julius is gray.
hypothesis_assertion: Bernhard is a frog, or Julius is gray.