context: There is almost no chance that Brian is a swan. Chances are slight that Bernhard is white. It is probable that Greg is white.
hypothesis: It is likely that brian is a swan, or Greg is white.
valid_hypothesis: It is likely that brian is a swan, or Greg is white.
invalid_hypothesis: It is probably not the case that brian is a swan, or Greg is white.
hypothesis_assertion: Brian is a swan, or Greg is white.