context: It is improbable that Brian is a lion. Chances are slight that Greg is gray. It is impossible that Lily is a swan.
hypothesis: It is certain that either Brian is a lion, or Greg is gray.
valid_hypothesis: It is unlikely that either Brian is a lion, or Greg is gray.
invalid_hypothesis: It is certain that either Brian is a lion, or Greg is gray.
hypothesis_assertion: Either Brian is a lion, or Greg is gray.