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A Surface which is related to Cayley Numbers.
References
Coxeter, H. S. M.  Regular Polytopes, 3rd ed.  New York: Dover, p. 211, 1973.
 
Hunt, B.  ``Del Pezzo Surfaces.''  §4.1.4 in The Geometry of Some Special Arithmetic Quotients.
  New York: Springer-Verlag, pp. 128-129, 1996.