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Remove duplicate rows.
If you are cleaning up a mailing list, you might want to dedupe on the 'email' column, after converting all the emails to lower case.
•Check the column(s) you wish to look for duplicate values in.
•Rows are considered duplicates if they have exactly the same value in all the checked columns.
•When several rows are duplicates, only the top one is retained.
•The Unique transform is a more powerful (but more complex and slower) alternative to Dedupe.