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2. to : |T| 3. from : |T| 4. f : Edge(T) 5. bi-tree(T;to;from) 6. bi-graph(T;to;from) 7. 7. 7. lconnects(p;i;j) & ( 8. 9. |T| 10. spanner(f;T;to;from) 11. i : |T| 12. j : |T| 13. spanner-root(f;T;to;from;i) 14. spanner-root(f;T;to;from;j) | 36 steps |
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