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Arcesium's batch-processing operations may receive equivalent labels from different monitoring paths. Given two strings, determine whether they are anagrams after ignoring case and every non-alphanumeric character.
Two strings are normalized by applying Unicode case folding and retaining only characters for which isalnum() is true. The strings are anagrams if their normalized forms contain the same characters with the same frequencies.
Implement are_anagrams(s, t), where s and t are strings. Return a boolean: True if the normalized strings are anagrams, otherwise False.
The comparison is case-insensitive. Spaces, punctuation, and symbols do not contribute to the result. Repeated characters must occur the same number of times.
def are_anagrams(s, t):