try

Code
-------------------

Private Sub UserForm_Initialize()
Dim dic As Object, x, r As Range
Set dic = CreateObject("Scripting.Dictionary")
With Sheets("sheet1")
For Each r In .Range("a2:a4")
If Not IsEmpty(r) And Not dic.exists(r.Value) Then
dic.Add r.Value, Nothing
End If
Next
End With
x = dic.keys
Me.ComboBox1.List() = x
Set dic = Nothing: Erase x
End Sub

-------------------

--
jindo
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