title: How to make a new list of first elements from existing list of lists
body: <p>I have a list below. I need to use it to create a new list with only country names.
  How do I loop <code>x</code> in order to have a list of country names?</p>
  <pre><code>x = [[&quot;UK&quot;, &quot;LONDON&quot;, &quot;EUROPE&quot;],
       [&quot;US&quot;, &quot;WASHINGTON&quot;, &quot;AMERICA&quot;],
       [&quot;EG&quot;, &quot;CAIRO&quot;, &quot;AFRICA&quot;],
       [&quot;JP&quot;, &quot;TOKYO&quot;, &quot;ASIA&quot;]]
  </code></pre>
  <p>The outcome should look like</p>
  <pre><code>UK
  US
  EG
  JP
  </code></pre>