Shoppers wrestle over a television as they compete to purchase retail items on "Black Friday" at an Asda superstore in Wembley, north London, in this file photograph dated November 28, 2014. Spending in Britain on next week's "Black Friday" discount shopping day looks set to break last year's record despite warnings that retailers would be wise to shun an event imported from the United States. (Photo by Luke MacGregor/Reuters)
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