context: It is certain that Julius is a swan. It is probably the case that Greg is yellow. We doubt that Lily is gray.
hypothesis: There is a very good chance that either Lily is gray, or Julius is a swan.
valid_hypothesis: There is a very good chance that either Lily is gray, or Julius is a swan.
invalid_hypothesis: It is impossible that either Lily is gray, or Julius is a swan.
hypothesis_assertion: Either Lily is gray, or Julius is a swan.