How to get all possible permutation in VBA

Take this:

Sub MagicSquarePermutations()
    Dim nums As Variant
    nums = Array(1, 2, 3, 4, 5, 6, 7, 8, 9)
    
    Dim results As Collection
    Set results = New Collection
    
    Call Permute(nums, 0, results)
    
    ' Output results to sheet
    Dim ws As Worksheet
    Set ws = ThisWorkbook.Sheets(1)
    ws.Cells.Clear
    
    Dim i As Long, arr As Variant
    i = 1
    For Each arr In results
        ws.Cells(i, 1).Resize(1, 9).Value = arr
        i = i + 1
    Next arr
End Sub

Sub Permute(nums As Variant, l As Integer, results As Collection)
    Dim r As Integer
    If l = UBound(nums) Then
        If IsMagic(nums) Then results.Add nums
    Else
        For r = l To UBound(nums)
            Swap nums(l), nums(r)
            Permute nums, l + 1, results
            Swap nums(l), nums(r)
        Next r
    End If
End Sub

Function IsMagic(nums As Variant) As Boolean
    IsMagic = _
        nums(0) + nums(1) + nums(2) = 15 And _
        nums(3) + nums(4) + nums(5) = 15 And _
        nums(6) + nums(7) + nums(8) = 15 And _
        nums(0) + nums(3) + nums(6) = 15 And _
        nums(1) + nums(4) + nums(7) = 15 And _
        nums(2) + nums(5) + nums(8) = 15 And _
        nums(0) + nums(4) + nums(8) = 15 And _
        nums(2) + nums(4) + nums(6) = 15
End Function

Sub Swap(a As Variant, b As Variant)
    Dim tmp As Variant
    tmp = a: a = b: b = tmp
End Sub