If your CSV file contains more than 50,000 records, you can manually split the CSV into separate files containing fewer than 50,000 records. Process each file independently to remove duplicates and generate smaller lists. The smaller lists may be recombined, and you may wish to re-run the list to catch any duplicates between the split files.
How can I dedupe my large CSV with over 50,000 records using CleanCSV?
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