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    • GDD (n1, n, n + 1, 4; λ1, λ2) for n1 = 1 or 2 

      Namyaloa, Kasifa; Sarvateb, Dinesh G.; Zhang c, Li (Strathmore University, 2017)
      The main subject matter for this paper is GDDs with three groups of sizes 1, n, (n≥ 2) and n + 1, respectively, and block size four. A block has Configuration (1, 1, 2), means the block has the point from the group of size ...