title: How to make list selection option unique in mat-selection-list?
body: <p>I have a use case wherein I need to make a list selection unique in Angular2 Material mat-selection list..</p>
  
  <p>I have gone through </p>
  
  <pre><code>https://github.com/angular/material2/blob/master/src/demo-app/list/list-demo.html
  </code></pre>
  
  <p>and </p>
  
  <p><a href="https://github.com/angular/material2/blob/master/src/lib/list/selection-list.spec.ts" rel="nofollow noreferrer">https://github.com/angular/material2/blob/master/src/lib/list/selection-list.spec.ts</a></p>
  
  <p>Please help..</p>