public static void main(String[] args) {
   SplaySymbolTable<Integer, Integer> table = new SplaySymbolTable<Integer, Integer>();
   int[] keys = {1, 2, 3, 4, 9, 8, 7, 6};
   for (int i = 0; i < keys.length; i++) table.insert(keys[i], keys[i]);
   printTree(table, "splay-tree-1.svg");
   table.search(3);
   table.search(9);
   table.search(7);
   printTree(table, "splay-tree-2.svg");
 }