context: Chances are about even that Emily is a mouse. It is impossible that Lily is a swan. It is almost certain that Greg is yellow.
hypothesis: It is impossible that emily is a mouse, and Lily is a swan.
valid_hypothesis: It is impossible that emily is a mouse, and Lily is a swan.
invalid_hypothesis: There is a very good chance that emily is a mouse, and Lily is a swan.
hypothesis_assertion: Emily is a mouse, and Lily is a swan.