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Ω ={1,2,…,v}:B = family of k points subset in Ω:(set of blocks) D = (Ω,B): d = max{|x1∩x2||x1,x2 ∈B,x1≠x2}:(v, k, d) is called the parameter of D,or, D is a design with the parameter (v,k,d) and B is called a (v,k,d) set.