context: Chances are slight that Greg is a swan. It is probably not the case that Brian is gray. Chances are slight that Bernhard is a frog. It is almost certain that if either Brian is gray, or Greg is a swan, then Mary took the apple. It is certain that if Brian is gray, and Greg is a swan, then Jeff moved to the office. It is certain that if Greg is a swan, and Bernhard is a frog, then Lily is green.
hypothesis: There is almost no chance that jeff moved to the office, and Greg is a swan.
valid_hypothesis: There is almost no chance that jeff moved to the office, and Greg is a swan.
invalid_hypothesis: There is a better than even chance that jeff moved to the office, and Greg is a swan.
hypothesis_assertion: Jeff moved to the office, and Greg is a swan.