19. Some uncles are ungenerous; All merchants are generous.
20. No unhappy people chuckle; No happy people groan.
21. Audible music causes vibration in the air; Inaudible music is not worth paying for.
22. He gave me five pounds; I was delighted.
23. No old Jews are fat millers; All my friends are old millers.
24. Flour is good for food; Oatmeal is a kind of flour.
25. Some dreams are terrible; No lambs are terrible.
26. No rich man begs in the street; All who are not rich should keep accounts.
27. No thieves are honest; Some dishonest people are found out.
28. All wasps are unfriendly; All puppies are friendly.