_set.all in template should be simple, wood and trees maybe?

I dont get the hot_topic_set.all from the newsletter instance x and I really don't see why can anyone else please?

model:
class NewsLetter(models.Model):
    title = models.CharField(max_length=200)
    text = models.TextField(null=True, blank=True)
    document = models.FileField(upload_to="newsletters/", null=True, blank=True)
    priority = models.IntegerField(default=50)

    def __unicode__(self):
        return self.title

    def get_absolute_url(self):
        return "/newsletters/"

    class Meta:
        ordering = ('priority',)

class Hot_Topic(models.Model):
    newsletter = models.ForeignKey(NewsLetter, related_name="letter_set")
    topic = models.CharField(max_length=100)
    priority = models.IntegerField(default=50)

    class Meta:
        verbose_name_plural = "Hot Topics"
        ordering = ('priority',)

view
def index(request):
    list = NewsLetter.objects,all()
    return render_to_response('newsletter/index.html', {''list': list,}, context_instance=RequestContext(request))

template:
{% for x in list %}
    {% if x.text %}
        .........
    {% else %}
        {% for t in x.hot_topic_set.all %}
            {{ t.topic }}
        {% endfor %}
   {% endif %}
{% endfor %}

I dont get the hot_topic_set.all from the newsletter instance x and I really don't see why can anyone else please?
  

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