context: It is highly likely that John dropped the apple. There is almost no chance that Julius is gray. There is a better than even chance that Brian is green. It is certain that if Brian is green, or John dropped the apple, then Fred is in the office. It is probable that if either John dropped the apple, or Brian is green, then Mary left the milk. Chances are slight that if Brian is green, or John dropped the apple, then Yann is tired.
hypothesis: It is almost certain that brian is green, and John dropped the apple.
valid_hypothesis: Chances are about even that brian is green, and John dropped the apple.
invalid_hypothesis: It is almost certain that brian is green, and John dropped the apple.
hypothesis_assertion: Brian is green, and John dropped the apple.