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func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.makeKeyAndVisible()
        
        let viewController = ViewController()
        
        let navigationController = UINavigationController(rootViewController: viewController)
        
        window?.rootViewController = navigationController
        
        
        return true
}