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Best Buy Co. had disappointing holiday sales, worsening the concern about its ability to turn around the business. It was struggling even before the holidays, facing tough competition from Amazon, Walmart, and others. Its strategy included revamping merchandise, training employees, and cutting costs. Yet revenue for the nine weeks to Jan. 4 fell 3 percent to $11.45 billion. Sales at stores open at least a year, a key metric, fell 0.8 percent.