context: We doubt that Julius is a rhino. It is unlikely that Lily is a swan. It is probably the case that Brian is a frog.
hypothesis: It is improbable that brian is a frog, and Lily is a swan.
valid_hypothesis: It is improbable that brian is a frog, and Lily is a swan.
invalid_hypothesis: There is a better than even chance that brian is a frog, and Lily is a swan.
hypothesis_assertion: Brian is a frog, and Lily is a swan.