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Staples to close more stores

The largest office supplies chain by revenue said it will speed up closure of 15 U.S. stores, and plans to close 45 in Europe. It also plans to shut some of its delivery business in Europe as part of a strategic plan to accelerate growth, invest more in online and mobile efforts, and expand the product assortment it offers to business customers. Shares fell 4.5% to 11.80.