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Vertex SetPositive IntegerMinimum NumberPositive IntegersChromatic NumberLower BoundHadamard MatricesBipartite Graphthe Cartesian ProductPerfect MatchingCYCLE SYSTEMSGenerating FunctionSteiner Triple SystemComplete Bipartite GraphIndependent SetNecessary and Sufficient ConditionCayley DigraphsGraph TheoryRoman Domination NumberRamsey Number