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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 serve_concatenated_pdf_from_disk( filenames: Iterable[str], offered_filename: str = "crate_download.pdf", **kwargs) -> HttpResponse: """ Concatenates PDFs from disk and serves them. """

    pdf = get_concatenated_pdf_from_disk(filenames, **kwargs)
    return serve_buffer(pdf,
                        offered_filename=offered_filename,
                        content_type=MimeType.PDF,
                        as_attachment=False,
                        as_inline=True)