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<正>Let D(U,V,W) be an oriented 3-partite graph with |U|=P,|V|=q and|W|=r. For any vertex x in D(U,V,W),let d_x~+ and d_x~- be the outdegree and indegree of x respec- tively.Define a_(u_i) (or simply a_i )=q+r+d_(u_i)~+-d_(u_i)~-,b_(v_j)(or simply b_