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Quick Summary
Reconstruct a linear prerequisite chain from unordered edge pairs.
Identify the starting course by finding the node with no incoming dependencies.
Traverse the reconstructed path to return the exact middle course.
What This Tests
Graph representation using hash maps
Set operations for node degree analysis
Linear path traversal and indexing
Directed acyclic graph structure recognition
Common Patterns
Graph Traversal
Hashing
Path Reconstruction
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