context: Chances are about even that Greg is white. It is impossible that Bernhard is a lion. It is improbable that Julius is gray.
hypothesis: It is highly unlikely that julius is gray, and Greg is white.
valid_hypothesis: It is highly unlikely that julius is gray, and Greg is white.
invalid_hypothesis: There is a very good chance that julius is gray, and Greg is white.
hypothesis_assertion: Julius is gray, and Greg is white.