context: It is highly unlikely that Brian is a swan. It is highly unlikely that John is in the bathroom. There is almost no chance that Fred left the football.
hypothesis: It is certain that either John is in the bathroom, or Brian is a swan.
valid_hypothesis: Chances are slight that either John is in the bathroom, or Brian is a swan.
invalid_hypothesis: It is certain that either John is in the bathroom, or Brian is a swan.
hypothesis_assertion: Either John is in the bathroom, or Brian is a swan.