class Airplane {
    var model: int;
  
    function Airplane() {
      model = 767;
    }
  } 

  class Airplane {
    var model: int;
  
    function Airplane() {
      model = 767;
    }
  
    function Airplane(newModel : int) {
      model = newModel;
    }
  } 

  var thirdJet : Airplane;
  thirdJet = new Airplane();

  var fourthJet : Airplane;
  fourthJet = new Airplane(777);

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