... combinat orics 11 (20 04), #R2 17 3 Θ (d) 2 1 Θ Θ 13 23 123 3 12 2 1 (c) (b)(a) 3 12 23 13 123 12 3 23 12 123 13 1 3 21 2 13 1 123 Θ Θ Θ ΘΘΘ Θ Θ Θ 1 2 3 12 3 1 3 2 2 23 Figure 1: Four 3 -Venn diagrams. the ... combinat orics 11 (20 04), #R2 4 1 13 12 134 123 123 4 23 5 45 4 124 25 5 15 125 123 5 123 45 23 4 124 5 145 14 23 2 24 24 5 23 45 345 34 1345 135 35 3 Figure 7: The planar graph P obtained by embedding ... Θ 4 } highlighted. the electronic journal of combinat orics 11 (20 04), #R2 10 123 5 15 23 4 23 5 23 45 13 125 45 34 23 5 134 124 5 4 3 2 123 45 123 4 345145 25 24 135 1345 24 5 124 1 12 123 35 14 Figure 8: The geometric...
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