## Combinatorial mathematics IX: proceedings of the Ninth Australian Conference on Combinatorial Mathematics, held at the University of Queensland, Brisbane, Australia, August 24-28, 1981Elizabeth J. Billington, Sheila Oates-Williams, Anne Penfold Street |

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4-cycle a-blocks adjacent affine plane algebra algorithm Anne Penfold arrays Australia automorphism group Baer planes bijection binary blocks co-design colour scheme Combinatorial complete graph components Computer configuration construction contains countable cubic bipartite graph define denote Department of Mathematics disjoint distance-transitive graph edges elements equivalent example exists Figure finite fixed folders G x P2 girth given graph G group G hamiltonian cycle Hence hypergraph induced subgraph infinite integer intersect inversive planes isolated vertices isomorphism Kmod Lemma length Let G line graph Math matrix matroid mode number Moore graph multiset obtained orbits ovals pairs partitions permutation group planar planar graph points projective plane Proof Queensland realisation reconstructible result s-uniform semistable sequence structure subgraph of G subgroup subsets Suppose symmetric graph Theorem Tj(a transitive triple unique vectors vertex