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Britain's Prime Minister David Cameron gestures as he delivers a speech at the Aberdeen Exhibition and Conference Centre in Aberdeen, Scotland September 15, 2014.  Cameron appealed to Scots' emotions on his last visit to Scotland before this week's historic referendum by warning them on Monday that a vote to leave the United Kingdom would be irreversible. The referendum on Scottish independence will take place on September 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom.          REUTERS/Dylan Martinez (BRITAIN  - Tags: POLITICS ELECTIONS)   - RTR46BS8 Dylan Martinez/Reuters
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