[RESOLVED] COMBOBOX with not dupes...

I have this sheet in column A are many value.
I want to fill/populate combobox1 present in a userform with the first 3 digit of value in column A, but without duplicates...

example:
AED
AFN
ALL
AMD
...
XAF
XCD
XOF
XPF

first 3 digit or first 3 letters?

Code:

---

Private Sub CommandButton1_Click()
    '~~> This will add values from A1 to A10 in the combobox
    '~~> Change it as per your requirement
    For i = 1 To 10
        '~~> Add first 3 letters/digits
        ComboBox1.AddItem Left(Range("A" & i).Value, 3)
    Next i
    '~~> This will remove the duplicates
    Call RemoveDuplicates
End Sub
Sub RemoveDuplicates()
    Dim a As Integer, b As Integer, c As Integer
    a = ComboBox1.ListCount - 1
    Do While a >= 0
        For b = a - 1 To 0 Step -1
            If ComboBox1.List(b) = ComboBox1.List(a) Then
                ComboBox1.RemoveItem b
                a = a - 1
            End If
        Next b
        a = a - 1
    Loop
End Sub

---