Two-Corpora Sample (100 TXT files)
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- corpus_a: 50 files of retail/product style reviews (intentionally messy)
- corpus_b: 50 files of movie/media style reviews (intentionally messy)

Messiness includes: URLs, emails, @mentions, hashtags, HTML, emojis, repeated chars, random case, numbers, extra whitespace.
Suggested labels: corpus_a -> 0 (retail), corpus_b -> 1 (movies)
