Mexico's central bank governor Agustin Carstens walks past a wedding car at the Ritz Carlton hotel in Moscow February 15, 2013. G20 officials struggled to find a common form of words on currency manipulation ahead of a summit on Friday at which divisions within the group over growth versus austerity looked set to flare back into life. REUTERS/Sergei Karpukhin (RUSSIA - Tags: BUSINESS POLITICS)