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FILE PHOTO: Credit cards of American Express are photographed in
FILE PHOTO: Credit cards of American Express are photographed in this illustration picture at an office in Frankfurt, Germany, March 17, 2016. REUTERS/Kai Pfaffenbach
FILE PHOTO: Credit cards of American Express are photographed in this illustration picture at an office in Frankfurt, Germany, March 17, 2016. REUTERS/Kai Pfaffenbach