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All Rights Reserved. Authorised translation from the English language edition published by John Wiley & Sons Limited. Responsibility for the accuracy of the translation rests solely with Posts & Telecom Press Co.,Ltd and is not the responsibility of John Wiley & Sons Limited.

No part of this book may be reproduced in any form without the written permission of the original copyright holder, John Wiley & Sons Limited.

本书中文简体版授权人民邮电出版社在全球独家出版发行。未经出版者许可，不得以任何方式复制或者节录本书的任何部分。

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