How can this code be modified to eliminate duplicates?

[Kirch1995]

I am trying in excel to take a list of teams A through ? and group them into sets of three. I found a code that would do this, but now I need to eliminate any repeat use of combinations. For example if one set is ABC then I can not use the combinations with AB, AC or BC in them. If anyone can help I would appreciate it. It is for a youth basketball league and I am VB illiterate.
The code that I found is

[Sub FindSets()
Dim iA() As Integer
Dim sUniv As String
Dim iWanted As Integer
Dim j As Integer
Dim k As Integer

sUniv = Cells(1, 1).Value
iWanted = Cells(2, 1).Value

ReDim iA(iWanted)
For j = 1 To iWanted
iA(j) = j
Next j

iRow = PutRow(iA, sUniv, 1)

Do Until DoneYet(iA, Len(sUniv))
j = WorkHere(iA, Len(sUniv))
iA(j) = iA(j) + 1
For k = j + 1 To iWanted
iA(k) = iA(k - 1) + 1
Next k
iRow = PutRow(iA, sUniv, iRow)
Loop
End Sub

Function DoneYet(iB, n) As Boolean
iMax = UBound(iB)
Temp = True
For j = iMax To 1 Step -1
If iB(j) <> j + (n - iMax) Then
Temp = False
End If
Next
DoneYet = Temp
End Function

Function WorkHere(iB, n) As Integer
iMax = UBound(iB)
j = iMax
Do Until iB(j) <> j + (n - iMax)
j = j - 1
Loop
WorkHere = j
End Function

Function PutRow(iB, sUniv, i)
iMax = UBound(iB)
sTemp = ""
For j = 1 To iMax
sTemp = sTemp & Mid(sUniv, iB(j), 1)
Next j
Cells(i, 2).Value = sTemp
PutRow = i + 1
End Function]

I found this at http://excel.tips.net/Pages/T006766_Listing_Combinations.html