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{% for post in site.posts %}
  {% unless post.draft %}
    <li>
      <a href="{{ post.url }}">{{ post.title }}</a>
    </li>
  {% endunless %}
{% endfor %}

---
title: My example draft post
date: 2012-06-04
slug: 2012/06/04/my-example-draft-post
draft: true
---

This post shouldn't show up in overview pages due to its `draft` key being set.

(Jekyll doesn't care what extra keys are set, so why not use that feature.)