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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 _get_content(self, context):
 """ Add the csrf_token_value because the mixin use render_to_string and not render. """

        self._valid_template()
        context.update({
            "csrf_token_value": get_token(self.request)
        })
        return render_to_string(self.get_template_names(), context)