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SomeModule = {
  methodFromSomeModule: function() {}
};

SomeOtherModule = {
  methodFromSomeOtherModule: function() {}
};

Person = Class.create(function() {

  // mixin instance methods to prototype
  Class.add(this, SomeModule);

  // mixin class methods
  Class.mixin(this, SomeOtherModule);

  // private variables just work
  var secret = 'I am a private variable!';

  // private methods just work
  function secretFunction() {
    return secret;
  };

  // add class methods one at a time
  this.anotherClassMethod = function() {
    return secretFunction();
  };

  // add instance methods one at a time
  this.prototype.anotherInstanceMethod = function() {
    return secretFunction();
  }

  // methods returned are added to prototype
  return {
    initialize: function() {},

    moreInstanceMethods: function() {
      return secretFunction();
    }
  };
});

Person.anotherClassMethod() //=> 'I am a private variable!'

var joe = new Person();
joe.anotherInstanceMethod() //=> 'I am a private variable!'