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Kmart to Revamp Borders, Walden Subsidiaries: Kmart Corp. launched a restructuring of its Borders Inc. and Walden Book Co. units, streamlining the bookstore operations to make them more attractive in a planned public stock sale next year. Under the plan, Kmart will create a new corporate unit, Borders Group Inc., to manage Borders, Waldenbooks and Planet Music Inc. The new company will be based in Borders’ current offices in Ann Arbor, Mich., and Walden’s Stamford, Conn., headquarters will be closed and consolidated into the new unit, leading to an undisclosed number of staff reductions.