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var Person = function(name, secondName, age, height, weight, socialInsuranceNumber) {

  // private properties/fields
  var _name = name || "Rob Gravelle";
  var _height = height || 68; //in inches
  var _weight = weight || 170;
  var _socialInsuranceNumber = socialInsuranceNumber || "555 555 555";

  function oPerson() {
      this.secondName = "Shabash" || secondName; //public memeber too
  }
  
  // public memeber  
  oPerson.prototype = {
    setHeight: function(height) { _height=height; },
    getHeight: function() { return  _height; },
    setWeight: function(weight) { _weight=weight; },
    getWeight: function() { return  _weight; },
    setName:   function(name) { _name=name; },
    getName:   function() { return  _name; },
    setSocialInsuranceNumber: function(socialInsuranceNumber) {  
        _socialInsuranceNumber=socialInsuranceNumber; 
    },
    calculateBmi: function() { 
        return Math.round(( _weight * 703) / ( _height *  _height)); 
    },
    age: age
  };

  return new oPerson();
};

//instantiate the Person class with some arguments
var aPerson = new Person("Ted Smith", "Feller", 34, 70, 175, "123 456 789");
//this displays "I am Ted Smith and and my BMI is 25."
console.log("My name is " + aPerson.getName() + ' ' + "and my BMI is " + aPerson.calculateBmi() + ".");
console.log("My second name is " + aPerson.secondName + ' ' + "and my age is " + aPerson.age + ".");