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The hypergraph of correlations corresponding to the hexagonal unit cell of the double hcb layer with Z = 4. In blue, red and green, hyperedges relative, respectively, to the 10, 01 and 11 directions; in grey hyperedges relative to finite, hexagonal alveoli. In white and orange, vertices representing configurations equivalent to H24 and H20 shown, respectively, in Figs. 12 ▸(a) and 12 ▸(b).
