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Copyright (C) Jeffrey Elkner and Natalia Cerna.

Permission is granted to copy, distribute and/or modify this document under

the terms of the GNU Free Documentation License, Version 1.3 or any later

version published by the Free Software Foundation; with Invariant Sections

being Preface and Contributor List, no Front-Cover Texts, and no Back-Cover

Texts. A copy of the license is included in the section entitled

“GNU Free Documentation License”.