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EU's chief Brexit negotiator Michel Barnier (C) talks with European Council President Donald Tusk (R) prior to the second day of two-day EU Summit in Brussels, Belgium, early on Oct. 20, 2017. (Xinhua/Ye Pingfan)

EU's chief Brexit negotiator Michel Barnier (C) talks with European Council President Donald Tusk (R) prior to the second day of two-day EU Summit in Brussels, Belgium, early on Oct. 20, 2017. (Xinhua/Ye Pingfan)