Multiple mixins override multiple same methods

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

application.route.js

import Ember from 'ember';
import InsertOneMixin from '../mixins/insert-one';
import InsertTwoMixin from '../mixins/insert-two';

export default Ember.Route.extend(InsertOneMixin, InsertTwoMixin, {
  init() {
    this._super(...arguments);
    console.log('init from route');
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

mixins.insert-one.js

import Ember from 'ember';

export default Ember.Mixin.create({
  init() {
    this._super(...arguments);
    console.log('init from insert-one');
  }
})

mixins.insert-two.js

import Ember from 'ember';

export default Ember.Mixin.create({
  init() {
    this._super(...arguments);
    console.log('init from insert-two');
  }
})

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}