#include <iostream>

#include <set>

using namespace std;

​

int main() {

  // Create a set with two equal elements (BMW is listed two times)

  set<string> cars = {"Volvo", "BMW", "Ford", "BMW", "Mazda"};

​

  // Print set elements

  for (string car : cars) {

    cout << car << "\n";

  }

  return 0;

}

​