| 1 | 10. l: Alph* 11. ||l|| < k 12. (S:l 13. 14. a: Alph* 15. b: Alph* 16. c: Alph* 17. 0 < ||b|| & l = ((a @ b) @ c) 18. (S:a @ c |
| 2 | 10. l: Alph* 11. ||l|| < k 12. (S:l 13. 14. a: Alph* 15. b: Alph* 16. c: Alph* 17. 0 < ||b|| & l = ((a @ b) @ c) 18. (S:a @ c 19. |
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