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An Amazon warehouse worker at the Peterborough fulfillment center in Cambridgeshire, England picks an order during Black Friday week, November 25, 2014 (Credit: AP Photo/Rex/Geoff Robinson)

An Amazon warehouse worker at the Peterborough fulfillment center in Cambridgeshire, England picks an order during Black Friday week, November 25, 2014 (Credit: AP Photo/Rex/Geoff Robinson)