tests/sav/tree_traversal.res

   1 preorder:
   2 1
   3 2
   4 4
   5 7
   6 5
   7 3
   8 6
   9 8
  10 9
  11 inorder:
  12 7
  13 4
  14 2
  15 5
  16 1
  17 8
  18 6
  19 9
  20 3
  21 postorder:
  22 7
  23 4
  24 5
  25 2
  26 8
  27 9
  28 6
  29 3
  30 1
  31 levelorder:
  32 1
  33 2
  34 3
  35 4
  36 5
  37 6
  38 7
  39 8
  40 9