Django template {%for%} tag add li every 4th element

I need to represent collection in the template and wrap every four elements in the

<li></li>

The template should be like this:

<ul>
    <li>
         <a></a>
         <a></a>
         <a></a>
         <a></a>
    </li>
    <li>
         <a></a>
         <a></a>
         <a></a>
         <a></a>
    </li>
    <li>
         <a></a>
         <a></a>
         <a></a>
         <a></a>
    </li>
</ul>

So i need to do it in the {% for %}

{% for obj in objects %}
 {#add at 1th and every 4th element li wrap somehow#}
    <a>{{object}}</a>
 {# the same closing tag li#}
{% endfor %}