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Assume there is an N : N relationship between entity A and B The two entities are: A={AID,F1}B={BID,F2} At the physical design level, these two entities are convert into: A={AID,F1,BID}B={BID,F2,AID}A={AID,F1,BID}B={BID,F2}A={AID,F1}B={BID,F2,AID}A={AID,F1}B={BID,F2}AB={ABID,AID,BID}