Find normalized list difference efficiently

Q: Find normalized list difference efficiently

This question evaluates competency in computing normalized list differences, including string normalization, collection comparison, duplicate handling, and time and space complexity reasoning.

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Question

Given two lists of strings, list1 and list2, return all elements that appear in list1 but not in list2 after applying a consistent normalization step (e.g., lowercase and trimming). Describe and implement an efficient algorithm, including the data structures you would use, handling of duplicates, and the time and space complexities.

Find normalized list difference efficiently

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