Own work, chart sourced from The Symmetries of Things, p.276, Figure 20.5 Types of Hexagons
John H. Conway, Heidi Burgiel, Chaim Goodman-Strauss, (2008) The Symmetries of Things, ISBN978-1-56881-220-5 (Chapter 20, Generalized Schaefli symbols, Types of symmetry of a polygon pp.275-278)
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