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LONDON, ENGLAND - FEBRUARY 9: Queen Elizabeth II before being presented with Letters of Credence by His Excellency Mr Abdesselam Aboudrar, the Ambassador of Morocco during a private audience at Buckingham Palace on February 9, 2017 in London, England. (Photo by John Stillwell - WPA Pool/Getty Images)

LONDON, ENGLAND - FEBRUARY 9:  Queen Elizabeth II before being presented with Letters of Credence by His Excellency Mr Abdesselam Aboudrar, the Ambassador of Morocco during a private audience at Buckingham Palace on February 9, 2017 in London, England. (Photo by John Stillwell - WPA Pool/Getty Images)

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LONDON, ENGLAND - FEBRUARY 9: Queen Elizabeth II is presented with Letters of Credence by His Excellency Mr Choe Il, the Ambassador of the Democratic People's Republic of Korea, accompanied by Mrs Kim Yong, during a private audience at Buckingham Palace on February 9, 2017 in London, England. (Photo by John Stillwell - WPA Pool/Getty Images)

LONDON, ENGLAND - FEBRUARY 9:  Queen Elizabeth II is presented with Letters of Credence by His Excellency Mr Choe Il, the Ambassador of the Democratic People's Republic of Korea, accompanied by Mrs Kim Yong, during a private audience at Buckingham Palace on February 9, 2017 in London, England. (Photo by John Stillwell - WPA Pool/Getty Images)

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LONDON, ENGLAND - FEBRUARY 9: Queen Elizabeth II is presented with Letters of Credence by His Excellency Mr Choe Il, the Ambassador of the Democratic People's Republic of Korea during a private audience at Buckingham Palace on February 9, 2017 in London, England. (Photo by John Stillwell - WPA Pool/Getty Images)

LONDON, ENGLAND - FEBRUARY 9:  Queen Elizabeth II is presented with Letters of Credence by His Excellency Mr Choe Il, the Ambassador of the Democratic People's Republic of Korea during a private audience at Buckingham Palace on February 9, 2017 in London, England. (Photo by John Stillwell - WPA Pool/Getty Images)

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LONDON, ENGLAND - FEBRUARY 9: Queen Elizabeth II shakes hands with Mrs Kim Yong after being presented with Letters of Credence by His Excellency Mr Choe Il, the Ambassador of the Democratic People's Republic of Korea, accompanied by Mrs Kim Yong, during a private audience at Buckingham Palace on February 9, 2017 in London, England. (Photo by John Stillwell - WPA Pool/Getty Images)

LONDON, ENGLAND - FEBRUARY 9:  Queen Elizabeth II shakes hands with Mrs Kim Yong after being presented with Letters of Credence by His Excellency Mr Choe Il, the Ambassador of the Democratic People's Republic of Korea, accompanied by Mrs Kim Yong, during a private audience at Buckingham Palace on February 9, 2017 in London, England. (Photo by John Stillwell - WPA Pool/Getty Images)