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Figure 1
(a) A labelled graph with vertices indicated by red circles and edges indicated by black lines, (b) the vertex and edge set of the graph. Vertices 1 and 3 are of degree 3 (3-connected) and vertices 2 and 4 are of degree 2 (2-connected).

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ISSN: 2053-2733
Volume 78| Part 3| May 2022| Pages 212-233
https://doi.org/10.1107/S2053273322001747
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