context: It is impossible that Brian is gray. There is little chance that Sandra got the apple. It is improbable that Greg is a frog. It is likely that if Brian is gray, and Greg is a frog, then Lily is a lion. It is unlikely that if Brian is gray, or Sandra got the apple, then Fred is in the office. We doubt that if Brian is gray, or Sandra got the apple, then John went to the garden.
hypothesis: It is impossible that lily is a lion, and Greg is a frog.
valid_hypothesis: It is impossible that lily is a lion, and Greg is a frog.
invalid_hypothesis: There is a very good chance that lily is a lion, and Greg is a frog.
hypothesis_assertion: Lily is a lion, and Greg is a frog.