context: It is probably not the case that Brian is green. It is unlikely that Antoine is thirsty. Chances are slight that John dropped the apple. We doubt that if either John dropped the apple, or Brian is green, then Greg is a swan. Chances are about even that if Antoine is thirsty, and Brian is green, then Mary is in the garden. It is likely that if either John dropped the apple, or Antoine is thirsty, then Emily is a mouse.
hypothesis: We believe that antoine is thirsty, and Greg is a swan.
valid_hypothesis: There is almost no chance that antoine is thirsty, and Greg is a swan.
invalid_hypothesis: We believe that antoine is thirsty, and Greg is a swan.
hypothesis_assertion: Antoine is thirsty, and Greg is a swan.