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import java.util.HashMap;

public class Main {
  public static void main(String[] args) {
    HashMap<String, String> capitalCities = new HashMap<String, String>();
    capitalCities.put("England", "London");
    capitalCities.put("India", "New Dehli");
    capitalCities.put("Austria", "Wien");
    capitalCities.put("Norway", "Oslo");
    capitalCities.put("Norway", "Oslo"); // Duplicate
    capitalCities.put("USA", "Washington DC");

    System.out.println(capitalCities); 
  }
}

              
{Austria=Wien, USA=Washington DC, Norway=Oslo, England=London, India=New Dehli}