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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 of(cls, msg_header: MessageHeader) -> 'MessageDecoder': """Return a decoder from the message header object. See Also: :meth:`.of_cte` Args: msg_header: The message header object. """

        cte_hdr = msg_header.parsed.content_transfer_encoding
        return cls.of_cte(cte_hdr)