References
  
  [Bog]         Bogomolny,        A.,        Sam        Loyd's        Fifteen,
  http://www.cut-the-knot.org/pythagoras/fifteen.shtml.
  
  [CCN+85]  Conway,  J.  H.,  Curtis,  R. T., Norton, S. P., Parker, R. A. and
  Wilson,  R.  A.,  Atlas  of  finite groups, Oxford University Press, Eynsham
  (1985),  xxxiv+252  pages,  ((Maximal  subgroups and ordinary characters for
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  [CN04]  Celler,  F. and Neunhöffer, M., XGAP, a graphical user interface for
  GAP,      Version     4.21     (2004),     ((Refereed     GAP     package)),
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  [GAP]   A   Bibliography   of  GAP  related  publications,  The  GAP  Group,
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  [JLPW95]  Jansen, C., Lux, K., Parker, R. and Wilson, R., An atlas of Brauer
  characters, The Clarendon Press Oxford University Press, London Mathematical
  Society  Monographs.  New  Series,  11,  New  York  (1995), xviii+327 pages,
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  [Köla]            Köller,            J.,            Peg           Solitaire,
  http://www.mathematische-basteleien.de/solitaire.htm.
  
  [Kölb]            Köller,            J.,            Rubik's            Cube,
  http://www.mathematische-basteleien.de/rubikscube.htm.
  
  [LN07]  Lübeck,  F.  and  Neunhöffer,  M.,  GAPDoc,  A  Meta Package for GAP
  Documentation,    Version    1.0    (2007),    ((Refereed   GAP   package)),
  http://www.math.rwth-aachen.de/~Frank.Luebeck/GAPDoc.
  
  [NCu] The ncurses C library, http://dickey.his.com/ncurses/ncurses.faq.html.
  
  [Neu07] Neunhöffer, M., IO, Bindings for low level C library IO, Version 2.2
  (2007),                           ((GAP                           package)),
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  [NMP13] Naughton, L., Merkwitz, T. and Pfeiffer, G., TomLib, The GAP Library
  of    Tables    of   Marks,   Version   1.2.4   (2013),   ((GAP   package)),
  http://schmidt.nuigalway.ie/tomlib/tomlib.
  
  [OR]  O'Connor,  J.  J.  and  Robertson,  E.  F.,  University of St Andrews,
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  [OR00]  O'Connor,  J.  J.  and  Robertson,  E.  F.,  Mathematical  MacTutor,
  University            of            St            Andrews            (2000),
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  [Sch]     Schönert,     M.,     Analyzing    Rubik's    Cube    with    GAP,
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  [WPN+07]  Wilson,  R.  A.,  Parker,  R.  A.,  Nickerson, S., Bray, J. N. and
  Breuer, T., AtlasRep, A GAP Interface to the Atlas of Group Representations,
  Version       1.3.1       (2007),       ((Refereed       GAP      package)),
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