int FILE_WRITE_ATTRIBUTES = 0x00000100; // 9
    /** Delete access right */
    int DELETE = 0x00010000; // 16
    /** Read control access right */
    int READ_CONTROL = 0x00020000; // 17
    /** Write DAC access right */
    int WRITE_DAC = 0x00040000; // 18
    /** Write owner access right */
    int WRITE_OWNER = 0x00080000; // 19
    /** Synchronize access right */
    int SYNCHRONIZE = 0x00100000; // 20

    assertEqualCharNodes(traverser.depthFirstPostOrder('a'), "dbca");
    assertEqualCharNodes(traverser.depthFirstPostOrder('b'), "db");
    assertEqualCharNodes(traverser.depthFirstPostOrder('c'), "dbac");
    assertEqualCharNodes(traverser.depthFirstPostOrder('d'), "d");
  }

  @Test
  public void forGraph_depthFirstPostOrderIterable_multigraph() {