title: Select multi sibling elements using one selector
body: <p>I'm crawling posts using Scrapy &amp; Python, and I found some data which I can't handle:  </p>
  
  <pre><code>&lt;li class="a b"&gt;Type1&lt;/li&gt;
  &lt;li class="c"&gt;Type2&lt;/li&gt;
  &lt;li class="c"&gt;Type2&lt;/li&gt;
  &lt;li class="c"&gt;Type2&lt;/li&gt;
  &lt;li class="a"&gt;Titles Type3&lt;/li&gt;
  &lt;li class="c"&gt;Type4&lt;/li&gt;
  &lt;li class="c"&gt;Type4&lt;/li&gt;
  &lt;li class="c"&gt;Type4&lt;/li&gt; 
  </code></pre>
  
  <p>I want to get all Type4 elements, and there are random size of type2 and 4, and one type1 and one type3.<br>
  I've tried <code>response.css('.c + .a +.c')</code> but this will only get the first Type4 element.<br>
  Could anyone come up with some advices or ideas?</p>