Function listUnique(rng As Range) As Variant

        Dim val As String
        Dim elements() As String
        Dim elementSize As Integer
        Dim newElement As Boolean
        Dim i As Integer
        Dim distance As Integer
        Dim allocationChunk As Integer
        Dim uniqueSize As Integer
        Dim r As Long
        Dim lLastRow  As Long

        lLastRow = rng.End(xlDown).Row

        elementSize = 1
        unqueSize = 0

        distance = Range(Application.Caller.Address).Row - rng.Row

        If distance <> 0 Then
            If Cells(Range(Application.Caller.Address).Row - 1, Range(Application.Caller.Address).Column).Value = "" Then
                listUnique = ""
                Exit Function
            End If
        End If

        For r = 1 To lLastRow
            val = rng.Cells(r)
            If val <> "" Then
                newElement = True
                For i = 1 To elementSize - 1 Step 1
                    If elements(i - 1) = val Then
                        newElement = False
                        Exit For
                    End If
                Next i
                If newElement Then
                    uniqueSize = uniqueSize + 1
                    If uniqueSize >= elementSize Then
                        elementSize = elementSize * 2
                        ReDim Preserve elements(elementSize - 1)
                    End If
                    elements(uniqueSize - 1) = val
                End If
            End If
        Next


        If distance < uniqueSize Then
            listUnique = elements(distance)
        Else
            listUnique = ""
        End If
    End Function