Copyright © 1999–2001 Barbara Morris.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license and the SGML document source are included with this document
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Original text modified by John D Lamb.