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https://toddmotto.com/angular-ngif-async-pipe
https://coryrylan.com/blog/angular-async-data-binding-with-ng-if-and-ng-else
https://blog.angular-university.io/angular-reactive-templates/
https://stackoverflow.com/questions/49631742/ngif-not-working-as-expected-with-observable
https://github.com/angular-redux/store/issues/375
https://alligator.io/angular/ngif-new-features-angular4/
https://blog.angularindepth.com/angular-question-rxjs-subscribe-vs-async-pipe-in-component-templates-c956c8c0c794
https://angular.io/api/common/NgIf
https://angular.io/api/common/AsyncPipe
https://nitayneeman.com/posts/using-single-subscription-for-multiple-async-pipes-in-angular/
https://juristr.com/blog/2017/06/new-enhanced-ngIf-and-ngFor/