context: There is almost no chance that Lily is a lion. We doubt that Brian is green. It is unlikely that Bernhard is a frog. It is certain that if Brian is green, and Bernhard is a frog, then Fred is in the school. Chances are about even that if Bernhard is a frog, or Lily is a lion, then Mary moved to the office. It is probably not the case that if Bernhard is a frog, or Brian is green, then Daniel left the football.
hypothesis: It is impossible that bernhard is a frog, and Lily is a lion.
valid_hypothesis: It is impossible that bernhard is a frog, and Lily is a lion.
invalid_hypothesis: There is a very good chance that bernhard is a frog, and Lily is a lion.
hypothesis_assertion: Bernhard is a frog, and Lily is a lion.