title: ul li li remove :before :after in second level.
body: <p>I want do something like that:
  I trying to ul first-child but no result. :(. </p>
  
  <pre><code>&lt;ul&gt;   
      &lt;li&gt;&lt;/li&gt; /* + :before */
      &lt;li&gt;&lt;/li&gt; /* + :before */
      &lt;li&gt;
          &lt;ul&gt;
              &lt;li&gt;&lt;/li&gt; /* remove :before or never create :before */
          &lt;/ul&gt;
      &lt;/li&gt; /* + :before */
      &lt;li&gt;&lt;/li&gt; /* + :before */
  &lt;/ul&gt;
  </code></pre>
  
  <p>please help.</p>