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Figure 7
(a) Two-dimensional fractal graph of the multiply twinned variants and Σ3n operators (up to order n = 5). The fractal is built from a Templar-style cross represented in (b) reduced in size by a factor of two at each generation step; the crosses are joined at the tips of those of the preceding generation. The variants are the tips of the crosses (not labelled) and the Σ3n operators are the centres of the crosses. This two-dimensional graph is usually called a Cayley graph.

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ISSN: 2053-2733
Volume 63| Part 1| December 2007| Pages 11-29
doi:10.1107/S0108767306044291
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