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Quick Summary
Extract valid words defined as consecutive sequences of English letters.
Count word frequencies case-insensitively using a hash map.
Retrieve the top 10 words ordered by frequency (desc) and lexicographically (asc) using a heap.
What This Tests
String parsing and tokenization logic.
Hash map application for frequency analysis.
Top-K selection efficiency using priority queues.
Handling complex sorting criteria via tuple comparison.
Common Patterns
Hashing
Heap / Priority Queue
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