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Atlassian
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Quick Summary
Group performances by singer to isolate individual role timelines.
Identify all role pairs per singer that fall within the specified year window.
Aggregate bidirectional counts across all singers and produce a lexicographically sorted result.
What This Tests
Hash-based grouping and data aggregation
Pairwise iteration and constraint checking
Lexicographical sorting and output normalization
Handling isolated elements in relationship mappings
Common Patterns
Hashing
Sorting
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