context: It is unlikely that Brian is white. Chances are slight that Mary went to the bedroom. It is certain that John got the milk. We doubt that if John got the milk, and Mary went to the bedroom, then Julius is a lion. There is a very good chance that if Brian is white, or Mary went to the bedroom, then Greg is a swan. It is almost certain that if Mary went to the bedroom, or John got the milk, then Winona is a mouse.
hypothesis: It is probable that julius is a lion, and Brian is white.
valid_hypothesis: It is impossible that julius is a lion, and Brian is white.
invalid_hypothesis: It is probable that julius is a lion, and Brian is white.
hypothesis_assertion: Julius is a lion, and Brian is white.