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for i =0 to ubound(sDate)
  for j =1 to list2.ListCount
      if sDate(i)= list2.list(j) then b=true
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  end if
next i

VB code:
Private Sub Command1_Click()
Dim i As Integer, j As Integer
Dim b As Boolean

For i = 0 To List1.ListCount - 1
If List1.Selected(i) Then
b = True
For j = 0 To List2.ListCount - 1
If List1.List(i) = List2.List(j) Then
b = False
Exit For
End If
Next j
If b Then List2.AddItem (List1.List(i))


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