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Quick Summary
Navigate between two pre-order labeled nodes in a mathematically defined Fibonacci tree.
Use recursive subtree sizes to map node indices without explicit construction.
Construct a directional move string using 'L', 'R', and 'U' characters.
What This Tests
Implicit tree traversal and index manipulation
Recursive problem decomposition
Lowest Common Ancestor path logic
Mathematical sequence application in data structures
Common Patterns
Divide and Conquer
Recursion
DFS/BFS
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