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Consideraplant,wherethereare20partworkerswhosejobsaretoproducefourtypesofparts(A,B,C,D).Eachofthemproducesfourpiecesofpartsofatmostthreedifferenttypeseachtime,suchas(1,1,2,0),(3,1,0,0),(2,2,0,0),(1,0,