context: We doubt that Bernhard is green. There is a better than even chance that Mary dropped the milk. It is unlikely that Brian is a lion. It is highly unlikely that if Mary dropped the milk, and Bernhard is green, then Yann is thirsty. It is unlikely that if either Bernhard is green, or Mary dropped the milk, then John discarded the apple. It is impossible that if Brian is a lion, or Mary dropped the milk, then Greg is a frog.
hypothesis: It is impossible that yann is thirsty, and Greg is a frog.
valid_hypothesis: It is impossible that yann is thirsty, and Greg is a frog.
invalid_hypothesis: It is likely that yann is thirsty, and Greg is a frog.
hypothesis_assertion: Yann is thirsty, and Greg is a frog.