A woman rides a bicycle as she leaves a polling station at the Royal Hospital in Chelsea, west London on June 23, 2016, as Britain holds a referendum to vote on whether to remain in, or to leave the European Union (EU). Millions of Britons began voting Thursday in a bitterly-fought, knife-edge referendum that could tear up the island nation's EU membership and spark the greatest emergency of the bloc's 60-year history. / AFP PHOTO / LEON NEAL
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