table.put('e', 5, "dog");
    table.put('c', 0, "axe");
    table.put('e', 3, "tub");
    table.put('r', 4, "foo");
    table.put('x', 5, "bar");
    validateTableCopies(table);
  }

  public void testCopyOfDense() {
    Table<Character, Integer, String> table = TreeBasedTable.create();
    table.put('c', 3, "foo");
    table.put('c', 2, "bar");
    table.put('c', 1, "baz");
    table.put('b', 3, "cat");