context: There is little chance that Emily is a cat. We doubt that Bill went to the kitchen. We believe that Brian is a frog. There is almost no chance that if Emily is a cat, or Brian is a frog, then Bernhard is a swan. There is a better than even chance that if either Emily is a cat, or Bill went to the kitchen, then Daniel dropped the apple. It is likely that if Bill went to the kitchen, and Brian is a frog, then Julius is white.
hypothesis: It is impossible that bernhard is a swan, and Daniel dropped the apple.
valid_hypothesis: It is impossible that bernhard is a swan, and Daniel dropped the apple.
invalid_hypothesis: It is certain that bernhard is a swan, and Daniel dropped the apple.
hypothesis_assertion: Bernhard is a swan, and Daniel dropped the apple.