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European Commission President Jean-Claude Juncker (R) greets British Prime Minister Theresa May prior to a Brexit negotiation meeting at EU headquarters in Brussels, Belgium, Dec. 4, 2017. (Xinhua/Ye Pingfan)

European Commission President Jean-Claude Juncker (R) greets British Prime Minister Theresa May prior to a Brexit negotiation meeting at EU headquarters in Brussels, Belgium, Dec. 4, 2017. (Xinhua/Ye Pingfan)