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Excel/Extract variable entangled content

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Question
Dear Tom, first off: a very happy new year to you!

Using Excel 2010, I've got alphanumeric data in cells A2 to B... (usually 200+ rows).
With formulas from C2 and D2 copying down, or VBA, how could I extract each Acnt (cnt for alphanumeric content) that relates to the B content in column C, and each Bcnt that relates to the A content in column D, conform below sample?

In the below sample, cells C5 and D5 equal the content of cells A5 and B5 respectively because content 'A1' only links to content 'B1', and 'B1' links to 'A1' alone. One or more contents of column A could relate to those of column B and the other way around. Hence cell C2 lists A5&A6&A7 as the 'A6' content in cell A2 links to content 'B6' in cell B2, whilst 'B6' also relates to content 'A7' (cell A7), that in turn links to content 'B5' (cell B4), where 'B5' links to 'A5' as well (cell A9).
   
  A   B   C        D
1   Acnt   Bcnt   Aextract     Bextract
2   A6   B6   A5&A6&A7  B5&B6
3   A4   B3   A4         B3&B4
4   A7   B5   A5&A6&A7  B5&B6
5   A1   B1   A1         B1
6   A3   B2   A2&A3      B2
7   A7   B6   A5&A6&A7   B5&B6
8   A2   B2   A2&A3       B2
9   A5   B5   A5&A6&A7   B5&B6
10   A4   B4   A4          B3&B4

Many thanks in advance, kind regards, Joe

Answer
Joe,

OK, I had some time to play with it and came up with this macro. It reproduces the results you show (although the string of characters in columns C and D are not in the same order you show).  

Sub abc()
Dim vA() As String, vB() As String
Dim r As Range, cell As Range, cell1 As Range
Dim i As Long, j As Long
Dim sA As String, sB As String
Dim added As Boolean, bFound As Boolean
Set r = Range("A2", Cells(Rows.Count, 1).End(xlUp))
For Each cell In r
 ReDim vA(1 To 1)
 ReDim vB(1 To 1)
 vA(1) = cell.Value
 vB(1) = cell.Offset(0, 1).Value
 Do
  added = False
  For Each cell1 In r
   If cell1.Address <> cell.Address Then
     For i = LBound(vA) To UBound(vA)
      If cell1 = vA(i) Then
        bFound = False
        For j = LBound(vB) To UBound(vB)
         If vB(j) = cell1.Offset(0, 1).Value Then
         bFound = True
         Exit For
         End If
        Next
        If Not bFound Then
         ReDim Preserve vB(1 To UBound(vB) + 1)
         vB(UBound(vB)) = cell1.Offset(0, 1).Value
         added = True
        End If
      End If
     Next i
     
     For i = LBound(vB) To UBound(vB)
      If cell1.Offset(0, 1).Value = vB(i) Then
        bFound = False
        For j = LBound(vA) To UBound(vA)
         If vA(j) = cell1.Value Then
         bFound = True
         Exit For
         End If
        Next
        If Not bFound Then
         ReDim Preserve vA(1 To UBound(vA) + 1)
         vA(UBound(vA)) = cell1.Value
         added = True
        End If
      End If
     Next i
     
   End If
  Next cell1
 Loop While added = True
 sA = ""
 sB = ""
 For i = LBound(vA) To UBound(vA)
   sA = sA & vA(i) & "&"
 Next
 sA = Left(sA, Len(sA) - 1)
 For j = LBound(vB) To UBound(vB)
   sB = sB & vB(j) & "&"
 Next
 sB = Left(sB, Len(sB) - 1)
 cell.Offset(0, 2).Value = sA
 cell.Offset(0, 3).Value = sB
Next cell
End Sub

It assumes your data starts in A2 as you show (with headers in row 1).


--
Regards,
Tom Ogilvy

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Tom Ogilvy

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