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Merger Would Create Largest Food Distributor: Supervalu Inc. and St. Louis-based Wetterau Inc. said they are planning a merger that would create the country’s largest food distributor. Supervalu, the nation’s No. 2 food wholesaler, would buy No. 4 Wetterau and make it a wholly owned subsidiary in a deal valued at about $1.1 billion, the companies said. The transaction is subject to further negotiations and approval by both companies’ boards, shareholders and regulators.