Macro to delete Non Duplicate Records

I have highlighted duplicate records in Col A using Conditional formatting.

I would like a macro to delete the rows containing non-duplicate records the are containied in Col A

Code:

---

Sub M_snb()
    [a1:A100] = [if(A1:A100="","",if(countif($A$1:$A$100,A1:A100)=1,"",A1:A100))]
    Columns(1).SpecialCells(4).EntireRow.Delete
End Sub

---

Thanks for the help, much appreciated

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