A school is organizing a debate competition with participants as speakers and judges. S={S1,S2,S3,S4} where S={S1,S2,S3,S4} represents the set of speakers. The judges are represented by the set: J={J1,J2,J3} where J={J1,J2,J3} represents the set of judges. Each speaker can be assigned only one judge. Let R be a relation from set S to J defined as: R={(x,y):speaker x is judged by judge y,x∈S,y∈J}.
