context: It is probable that Bernhard is a swan. There is a better than even chance that John grabbed the milk. It is impossible that Sandra left the football.
hypothesis: There is a better than even chance that sandra left the football, and Bernhard is a swan.
valid_hypothesis: It is impossible that sandra left the football, and Bernhard is a swan.
invalid_hypothesis: There is a better than even chance that sandra left the football, and Bernhard is a swan.
hypothesis_assertion: Sandra left the football, and Bernhard is a swan.