At: formula or left sound1121121 1. concl: Formula List 2. M: Formula List 3. N: Formula List 4. q: Formula 5. r: Formula 6. a: Assignment 7. a | < M @ (qr.N),concl > 8. a |= < r.(M @ N),concl > 9. a | < q.(M @ N),concl > a | < r.(M @ N),concl >