context: It is probably not the case that Bill is in the school. It is probable that Greg is a swan. There is a better than even chance that Lily is a rhino.
hypothesis: Chances are about even that lily is a rhino, and Greg is a swan.
valid_hypothesis: Chances are about even that lily is a rhino, and Greg is a swan.
invalid_hypothesis: It is certain that lily is a rhino, and Greg is a swan.
hypothesis_assertion: Lily is a rhino, and Greg is a swan.