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IBM Journal of Research and Development

© Copyright 2002 by International Business Machines Corporation. Copying in printed form for private use is permitted without payment of royalty provided that (1) each reproduction is done without alteration and (2) the Journal reference and IBM copyright notice are included on the first page. The title and abstract, but no other portions, of this paper may be copied or distributed royalty free without further permission by computer-based and other information-service systems. Permission to republish any other portion of this paper must be obtained from the Editor.

Post-1994 articles may be copied or distributed electronically for other than private use, provided that the per-copy fee is paid through the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923 U.S.A. The fee is $5.00 per copy, code: 0018-8646/2002/$5.00 © 2002 IBM

Table of contents page may be freely copied and distributed in any form.

ISSN 0018-8646. Printed in U.S.A.