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private void print_order(TreeNode root){
      if (root == null){
          return;
      }
      print_postOrder(root.left);
      print_postOrder(root.right);
      print(root);

      print(root);
      print_preOrder(root.left);
      print_preOrder(root.right);

      print_inOrder(root.left);
      print(root);
      print_inOrder(root.right);
}