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Copyright (c)  2000  David Wood.
 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 is available at 
http://www.gnu.org/copyleft/fdl.html.
 
  
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