context: It is likely that Bernhard is a swan. Chances are about even that Lily is a frog. It is impossible that John dropped the apple.
hypothesis: It is impossible that john dropped the apple, and Lily is a frog.
valid_hypothesis: It is impossible that john dropped the apple, and Lily is a frog.
invalid_hypothesis: Chances are about even that john dropped the apple, and Lily is a frog.
hypothesis_assertion: John dropped the apple, and Lily is a frog.