context: It is probable that Brian is a frog. It is improbable that Lily is a lion. Chances are slight that Bill is in the school. There is a very good chance that if Brian is a frog, and Bill is in the school, then Mary picked up the milk. We believe that if Lily is a lion, or Bill is in the school, then Bernhard is a frog. There is a very good chance that if either Brian is a frog, or Bill is in the school, then Greg is yellow.
hypothesis: It is highly unlikely that brian is a frog, and Lily is a lion.
valid_hypothesis: It is highly unlikely that brian is a frog, and Lily is a lion.
invalid_hypothesis: There is a very good chance that brian is a frog, and Lily is a lion.
hypothesis_assertion: Brian is a frog, and Lily is a lion.