title: Run ngFor several times
body: <p>I'm using Angular 7. </p>
  
  <p>I got a an array and I'm doing the usual <code>ngFor</code> in the HTML:</p>
  
  <pre><code>&lt;mat-card *ngFor="let card of cardNames"&gt;
  </code></pre>
  
  <p>Is there a way to iterate over the <code>cardNames</code> elements more than once?</p>