anchor.diff:  
     Once we're finished, we'll remove the `CrisisCenterModule` from our `AppModule`'s imports.
   
  -  Here are our updated modules:
  +  Here are the updated modules _before enabling preload_:
   
   +makeTabs(
      `router/ts/app/app.module.ts,
  
positive.code:   `)
  
  :marked
    In order to enable pre-loading of all modules, we'll import the `PreloadAllModules` token from the router package. The second argument in the
    `RouterModule.forRoot` method takes an object where we can provide additional configuration options. We'll use the `preloadingStrategy` property
    with the `PreloadAllModules` token. This enables the built-in *Router* pre-loader to eagerly load **all** [unguarded](#preload-canload) feature areas that use `loadChildren`.
  
  +makeExcerpt('app/app-routing.module.6.ts (preload all)', '')
  
  
negative.code:   * No pre-loading at all which is the default. Lazy loaded feature areas are still loaded on demand.
    * Pre-loading of all lazy loaded feature areas.
  
    The *Router* also supports [custom preloading strategies](#custom-preloading) for fine control over which modules to pre-load.
  
    We'll update our *CrisisCenterModule* to be loaded lazily by default and use the `PreloadAllModules` strategy 
    to load _all_ lazy loaded modules as soon as possible.
  
  <a id="preload-canload"></a>
  .l-sub-section
    :marked
      The **PreloadAllModules** strategy does not load feature areas protected by a [CanLoad](#can-load-guard) guard and this is by design.
      The *CanLoad* guard blocks loading of feature module assets until authorized to do so. If you want to both preload a module and guard
      against unauthorized access, use the [CanActivate](#can-activate-guard) guard instead.
  
  :marked
    We'll update our route configuration to lazy load the *CrisisCenterModule*. We follow the same process as we did when we loaded the *AdminModule* asynchronously.
    In the *crisis-center-routing.module.ts*, we'll change the *crisis-center* path to an *empty path* route.
  
    We'll move our redirect and *crisis-center* route to our `AppRoutingModule` routes and use the `loadChildren` string to load the *CrisisCenterModule*.
  