This work has been released into the public domain by its author, Vitaly Golovach. This applies worldwide. In some countries this may not be legally possible; if so: Vitaly Golovach grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
This is an image created by Vitaly Golovach, available on his website: [http://theorie5.physik.unibas.ch/golovach/]. He has granted permission to publish the picture without restrictions in electronic form or in print (see the declaration on his website
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18 December 2006
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