[GAP]   
 GAP -- Groups, Algorithms, and 
                  Programming, Version 4.4.9,
 The GAP Group,
 Aachen, St Andrews
 (2006)
(http://www.gap-system.org).
[Lam85] Lamport, L., LaTeX: A Document Preparation System, Addison-Wesley (1985).
[Neu07]   Neunhöffer, M.,
 IO,
         Bindings for low level C library IO,
         Version 2.2
 (2007)
(GAP package),
http://www-groups.mcs.st-and.ac.uk/~neunhoef/Computer/Software/Gap/io.html.
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