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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_embed_js(self, js_embed: Iterable[bytes]) -> bytes: """Default method used to render the final embedded js for the rendered webpage. Override this method in a sub-classed controller to change the output. """

        return (
            b'<script type="text/javascript">\n//<![CDATA[\n'
            + b"\n".join(js_embed)
            + b"\n//]]>\n</script>"
        )