context: It is certain that Julius is a frog. It is almost certain that Lily is white. It is impossible that Bernhard is gray.
hypothesis: It is certain that lily is white, and Bernhard is gray.
valid_hypothesis: It is impossible that lily is white, and Bernhard is gray.
invalid_hypothesis: It is certain that lily is white, and Bernhard is gray.
hypothesis_assertion: Lily is white, and Bernhard is gray.