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| 1 |
11. v : T List 12. ||v|| = k+1 12. 12. v[0] = x 12. 12. last(v) = y@0 12. 12. ( 12. 12. ( 12. (||L1|| = k-1+1 12. (& L1[0] = v[1] & last(L1) = y@0 & ( 13. ||v||+1 = k+1 14. u = x 15. last([u / v]) = y@0 16. | 6 steps |
| 2 |
11. v : T List 12. ||v|| = k+1 12. 12. v[0] = x 12. 12. last(v) = y@0 12. 12. ( 12. 12. ( 12. (||L1|| = k-1+1 12. (& L1[0] = v[1] & last(L1) = y@0 & ( 13. ||v||+1 = k+1 14. u = x | 1 step |
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