context: Chances are slight that Bernhard is white. It is certain that Greg is a swan. There is almost no chance that Daniel got the milk.
hypothesis: It is certain that either Daniel got the milk, or Greg is a swan.
valid_hypothesis: It is certain that either Daniel got the milk, or Greg is a swan.
invalid_hypothesis: Chances are about even that either Daniel got the milk, or Greg is a swan.
hypothesis_assertion: Either Daniel got the milk, or Greg is a swan.