context: It is almost certain that Bernhard is yellow. Chances are about even that Brian is a swan. It is likely that Greg is a swan.
hypothesis: It is probably not the case that brian is a swan, and Greg is a swan.
valid_hypothesis: It is probably not the case that brian is a swan, and Greg is a swan.
invalid_hypothesis: It is probably the case that brian is a swan, and Greg is a swan.
hypothesis_assertion: Brian is a swan, and Greg is a swan.