Copyright © 1992 by McGraw-Hill, Inc. All rights reserved. Printed in the United States of America. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a data base or retrieval system, without the prior written permission of the publisher.

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ISBN 0-07-0314e! 01-b

The sponsoring editor for this book was Gail F. Naiven, the editing supervisor was Peggy Lamb, and the production supervisor was Donald F. Schmidt. This book was set in Century Schoolbook by McGraw-Hill's Professional Book Group composition unit.

Printed and bound by R. R. Donnelley & Sons Company.

Information contained in this work has been obtained by McGraw-Hill, Inc. from sources believed to be reliable. However, neither McGraw-Hill nor its authors guarantee the accuracy or completeness orany information published herein and neither McGraw-Hill nor its authors shall be responsible for any errors, omissions, or damages arising out of use of this information. This work is published with the understanding that McGraw-Hill and its authors are supplying information but are not attempting to render engineering or other professional services. If such services are required, the of an appropriate professional should be sought,

To My Mum

Who contributed so much to my work over the years; inspired, encouraged and helped in preparing this book, but did not live to see it. Your memory will live forever in this book.

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