Sub ConnectArr()
'Updateby ExtendOffice
Dim xDValue As Variant
Dim xOutRg As Range
Dim xDictionary As Object
Dim xF As Long
Dim xChar As String
Dim xAddress As String
xAddress = "A1:A20" 'the data range
If Range(xAddress).Count > 20 Then
    MsgBox "The number of cells can't greater than 20!"
    Exit Sub
End If
xDValue = Range(xAddress).Value
Set xOutRg = Range("C1") 'output range
xChar = "," 'separator
For xF = 1 To UBound(xDValue)
    Set xDictionary = CreateObject("Scripting.Dictionary")
    xDictionary(0) = "Sets of " & xF
    Call ConnectValue(xDValue, xDictionary, 0, xF, 0, "", xChar)
    xOutRg.Offset(0, xF - 1).Resize(xDictionary.Count).Value = WorksheetFunction.Transpose(xDictionary.Items)
    Set xDictionary = Nothing
Next
End Sub
Sub ConnectValue(ByRef pDValue, ByRef pDictionary, ByRef pLevel, ByVal pMaxLevel, ByVal pIndex, ByVal pValue, ByVal pChar)
Dim xF As Long
If pLevel = pMaxLevel Then
    pDictionary(pDictionary.Count + 1) = pValue
    Exit Sub
End If
For xF = pIndex + 1 To UBound(pDValue)
    If pValue = "" Then
        Call ConnectValue(pDValue, pDictionary, pLevel + 1, pMaxLevel, xF, pDValue(xF, 1), pChar)
    Else
        Call ConnectValue(pDValue, pDictionary, pLevel + 1, pMaxLevel, xF, pValue & pChar & pDValue(xF, 1), pChar)
    End If
Next
End Sub

Sub allcombination()
Dim Ray As Variant, n As Long, nn As Long, Allnum As String, c As Long
Dim Res As Long, obit, oSt, ipc, Tot As Long, oPst As Long, sNum As String
Ray = Application.Transpose(Range(Range("A2"), Range("A" & Rows.Count).End(xlUp)))
sNum = Join(Evaluate("TRANSPOSE(ROW(" & 1 & ":" & UBound(Ray) & "))"), ",")
For n = 1 To UBound(Ray)
    Tot = Tot + Application.Combin(UBound(Ray), n)
Next n
ReDim Oval(1 To Tot)
ReDim nRay(1 To Tot - UBound(Ray))
Do Until Allnum = sNum
   If c < UBound(Ray) Then
       For n = 1 To UBound(Ray)
             c = c + 1: Oval(c) = n
       Next n
   Else
       For n = 1 To UBound(Ray)
             Res = Res + 1
             obit = Oval(Res)
             oSt = Split(obit, ",")(UBound(Split(obit, ",")))
                For nn = oSt + 1 To UBound(Ray)
                    c = c + 1
                    Allnum = obit & "," & nn
                    Oval(c) = Allnum
                Next nn
         Next n
   End If
Loop
Dim s As Variant, nStr As String
    For oPst = UBound(Ray) + 1 To UBound(Oval)
        For Each s In Split(Oval(oPst), ",")
            nStr = nStr & IIf(nStr = "", Ray(s), "," & Ray(s))
        Next s
            nRay(oPst - UBound(Ray)) = nStr: nStr = ""
  Next oPst
Range("B1").Resize(UBound(nRay)).Value = Application.Transpose(nRay)
End Sub