Did I write the wrong HTML if statement?

<h1>{{session['sid']}}</h1> <!--'admin' is displayed-->
<ul>
{% {% if session['sid'] != 'admin' %}
    <li> <a href="/sendmail">Post Mail</a> </li>
    <li> <ahref="> Mailbox</a> </li>
{% {% endif %}
</ul>

The above is part of the html file, and session is a dictionary type of material from Python. I checked with the header that session['sid'] is admin {%if session['sid']!= 'admin' %} is not working properly. (The hyperlink should not come out, but it comes out.) Where should it be fixed? Thank you!