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MAIDENHEAD, ENGLAND - JUNE 08: Police hold a voters dog as they wait outside the polling station where Conservative Party leader Theresa May is expected to vote on June 8, 2017 in Maidenhead, England. Polling stations have opened as the nation votes to decide the next UK government in a general election. (Photo by Matt Cardy/Getty Images)

MAIDENHEAD, ENGLAND - JUNE 08:  Police hold a voters dog as they wait outside the polling station where Conservative Party leader Theresa May is expected to vote on June 8, 2017 in Maidenhead, England. Polling stations have opened as the nation votes to decide the next UK government in a general election.  (Photo by Matt Cardy/Getty Images)