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Quick Summary
Determine which words from a list match a given T9-style phone number sequence.
Digit '1' is ignored/skipped, while other digits map to specific letters or spaces.
Return all words whose character-to-digit translation exactly matches the normalized phone number.
What This Tests
Character mapping and encoding logic (T9 keypad rules).
String normalization and filtering techniques.
Efficient data retrieval using hash tables or dictionaries.
Handling special characters and edge cases in string processing.
Common Patterns
Hashing
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Python3
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Input
knownWords =
phoneNumber =
Output
Expected
