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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 render_flatpage(request, f):
 """ Internal interface to the flat page view. """

    # If registration is required for accessing this page, and the user isn't
    # logged in, redirect to the login page.
    if f.registration_required and not request.user.is_authenticated():
        from django.contrib.auth.views import redirect_to_login
        return redirect_to_login(request.path)
    if f.template_name:
        t = loader.select_template((f.template_name, DEFAULT_TEMPLATE))
    else:
        t = loader.get_template(DEFAULT_TEMPLATE)

    # To avoid having to always use the "|safe" filter in flatpage templates,
    # mark the title and content as already safe (since they are raw HTML
    # content in the first place).
    f.title = mark_safe(f.title)
    f.content = mark_safe(f.content)

    response = HttpResponse(t.render({
        'flatpage': f
    }, request))

    try:
        from django.core.xheaders import populate_xheaders
        populate_xheaders(request, response, FlatPage_i18n, f.id)
    except ImportError:
        pass
    return response