context: Chances are about even that Emily is a cat. It is likely that Greg is a swan. It is certain that Mary discarded the milk.
hypothesis: It is probably not the case that either Greg is a swan, or Mary discarded the milk.
valid_hypothesis: It is probably not the case that either Greg is a swan, or Mary discarded the milk.
invalid_hypothesis: It is likely that either Greg is a swan, or Mary discarded the milk.
hypothesis_assertion: Either Greg is a swan, or Mary discarded the milk.