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Figure 3
Left: the periodic point set S with the basis vectors [{\bf v}_{1} = (5,0)], [{\bf v}_{2} = (0,5)] and motif points [p = (2,1)], [q = (3,4)]. Middle: the periodic Euclidean graph [G\subset{\bb R}^{2}] with three types of straight-line edges: green, blue, orange of lengths [\sqrt{5},\sqrt{10},\sqrt{20}], respectively. Right: the labelled quotient graph Q has directed edges eg,eb,eo with translational vectors indicating integer shifts of cells (see Definitions 7, 8, 9).

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ISSN: 2053-2733
Volume 81| Part 6| November 2025| Pages 427-437
https://doi.org/10.1107/S2053273325008253
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