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function Person(name, title) {
  this.name = name;
  this.title = title;
  this.subordinates = [];
}

function Employee(name, title) {
  this.name = name;
  this.title = title;
  //this.sayHello = function() {
  //  console.log("Hello!");
  //};
}

Employee.prototype = new Person();

// Now sayHello() is only in prototype but not in every Employee instance.
Employee.prototype.sayHello = function() {
  console.log("Hello!");
};

emp1 = new Employee("name", "title");
emp2 = new Employee("name2", "title2");