Remove the outer list of a double list : <p>Let's say i have a list that consist of:</p>

<pre><code>[['a','b','c','d']]
</code></pre>

<p>Is there an easy way to remove the outer list so the output would be</p>

<pre><code>['a','b','c','d']
</code></pre>

<p>I figured something like pop, but that remove the element, and i just want to remove the outer list.</p>

<p>I know i could iterate over the double list and append the elements to a new list, and the problem would be solved, but im not happy with that solution, i want a smoother one with cleaner code.</p>
