Composition over Inheritance (and Kotlin)
Rock and Null

    404
    Page not found
    
      Unfortunately the page you were looking for could not be found.
    
    Go to the home page
  
  Great! You've successfully subscribed.
  

  Great! Next, complete checkout for full access.
  

  Welcome back! You've successfully signed in.
  

  Success! Your account is fully activated, you now have access to all content.
  
