context: It is probably the case that Julius is a rhino. There is almost no chance that Brian is a swan. It is certain that Mary discarded the milk.
hypothesis: It is certain that either Brian is a swan, or Mary discarded the milk.
valid_hypothesis: It is certain that either Brian is a swan, or Mary discarded the milk.
invalid_hypothesis: There is almost no chance that either Brian is a swan, or Mary discarded the milk.
hypothesis_assertion: Either Brian is a swan, or Mary discarded the milk.