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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def tags_published():
 """ Return the published tags. """

    from tagging.models import Tag
    from zinnia.models.entry import Entry
    tags_entry_published = Tag.objects.usage_for_queryset(
        Entry.published.all())
    # Need to do that until the issue #44 of django-tagging is fixed
    return Tag.objects.filter(name__in=[t.name for t in tags_entry_published])