context: It is highly unlikely that Greg is a lion. It is highly likely that Brian is white. It is likely that Mary went to the hallway. It is almost certain that if either Mary went to the hallway, or Brian is white, then John picked up the apple. It is likely that if Brian is white, and Greg is a lion, then Julius is gray. It is certain that if Greg is a lion, and Mary went to the hallway, then Bernhard is a swan.
hypothesis: It is impossible that john picked up the apple, and Bernhard is a swan.
valid_hypothesis: It is impossible that john picked up the apple, and Bernhard is a swan.
invalid_hypothesis: There is a better than even chance that john picked up the apple, and Bernhard is a swan.
hypothesis_assertion: John picked up the apple, and Bernhard is a swan.