title: sass parent of parent specificity
body: <p>I write CSS in BEM style and have this code:</p>
  
  <pre><code>.nav {
      &amp;__list {
        &amp;__item {
        }    
      }
    &amp;__link {
      &amp;--active { 
      }
    }
  }
  </code></pre>
  
  <p>How do I get <code>.nav .nav__link--active</code> and <code>.nav__link.nav__link--active</code> from code above? How can I enhance the specificity by this method?</p>