context: We believe that John moved to the office. It is almost certain that Brian is gray. It is probable that Sandra left the football.
hypothesis: It is impossible that either John moved to the office, or Sandra left the football.
valid_hypothesis: Chances are about even that either John moved to the office, or Sandra left the football.
invalid_hypothesis: It is impossible that either John moved to the office, or Sandra left the football.
hypothesis_assertion: Either John moved to the office, or Sandra left the football.