p>
<pre class="src">
echo &#39;Defaults env_keeps=&quot;http_proxy https_proxy ftp_proxy&quot;&#39; | sudo tee -a /etc/sudoers
</pre>
<h1><span class="heading-number heading-number-1">3</span> It should be possible to write a colon at the beginning of an example</h1>
<blockquote>
  <p>I really love to write about
    :symbols. They sure are the
    best things in the world!</p>
</blockquote>
<pre class="src" lang="ruby">
{
:one =&gt; 1,
:two =&gt; 2
}
</pre>
<pre class="src" lang="clojure">
(defproject hell