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Aldred R E Dept of Mathematics University of Otago P O Box 56 Dunedin
Deng ChaiLing Dept of Mathematics University of Malaya 59100 Kuala Lumpur
Donovan Diane Mathematics Department University of Queensland St Lucia 4067
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adjacent appear apply array automorphisms balanced blocks called codes column combine complete components connected consider construction containing Corollary corresponding covers cycle cyclic define definition denote designs determined difference disjoint distance edge elements entries equal equations equivalent example exists extension fact Figure finite fixes flat function Further gap sequence triple give given graph Hence hole induced infinite integer least Lemma length lift lines Math Mathematics matrices matroid method minimal modular modulus Note obtain occurs one-point orientation pair partition paths periodic positive possible precisely prime implicants problem Proof properties prove rank regular respectively result satisfies space squares subgraph subgroup subset Suppose symmetric Table Theorem Theory transitive triple triple system twice unique University values vertex vertices weight