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main() {
  var gifts = {
    // Key:    Value
    'first': 'partridge',
    'second': 'turtledoves',
    'fifth': 'golden rings'
  };

  var nobleGases = {
    2: '氦',
    10: '氖',
    18: '氩',
  };

  print(gifts);
  print(nobleGases);

  var mySites=new Map();
  mySites['rsywx']=['rsywx.net','任氏有无轩'];
  mySites['wiki']=['rsywx.com','维基站点'];

  print(mySites);
  
  nobleGases[36]='氪';
  print(nobleGases);
  
  nobleGases[36]='Assignment to an exisitng key will override the original value';
  print(nobleGases);

}