This illustration was made by Luc Viatour.
Please credit this : Luc Viatour
An email to Viatour Luc would be appreciated too.
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Permission is granted to copy, distribute and/or modify this document under the terms of the
GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
