Recursion depth = 0
  Recursion depth = 1
    Recursion depth = 2
      Recursion depth = 3
        Recursion depth = 4
          Recursion depth = 5
            Recursion depth = 6
              Recursion depth = 7
                Recursion depth = 8
                  *** Base Case depth = 9
                Return from depth = 8
              Return from depth = 7
            Return from depth = 6
          Return from depth = 5
        Return from depth = 4
      Return from depth = 3
    Return from depth = 2
  Return from depth = 1
Return from depth = 0