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I too have some minor discrepancies on the duplicated lines exercise. My suggestion to give a crack on the Regex tool. It is a beautiful and elegant solution after cracking my head.
Number of tool used (not including browse for results): 20
I had everything correct but my overall #'s weren't correct. I was using the data cleansing macro instead of @patrick_digan 's approach with the replacechar() which for some reason is exactly what it needed. Once I swapped that out, my numbers tied 🙂