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You are hereby granted the right use, copy, and distribute any of the code on this web site, whether modified by you or not. You need not give attribution.

The textural material and pictures are copyright by the author, and the usual copyright rules apply. E.g., you may store the material on your computer and make hard or soft copies for your own use. However, you may not incorporate this material into another publication without written permission from the author.

The author has taken care in the preparation of this material, but makes no expressed or implied warranty of any kind and assumes no responsibility for errors or omissions. No liability is assumed for incidental or consequential damages in connection with or arising out of the use of the information or programs contained herein.

The author can not take responsibility for the contents of referenced pages.


Sigrid/Jasper Neumann
Schönauer Friede 78
52072 Aachen

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Last change: 2011-08-20