I just finished a more or less the same job.
I tried two approaches but finally I used the easied one.
1. FIRST SOLUTION.
Place the worksheet function to determine the double entries. The COUNTIF takes a cell value and look if this appears in a range. If there is 1 or more appearance he set D (Duplicate) in a Column.
With a short IIF you delete the D's for example.
2. SECOND SOLUTION :
A complete sub or function dat delete every double without writing the COUNTIF function to you sheet.
If you want some more explanation or feedback or code, ask ....
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