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LONDON, ENGLAND - DECEMBER 01: Queen Elizabeth II visits Goodenough College on December 1, 2016 in London, England. Goodenough College is the leading residential community for British and international postgraduate students studying in London. (Photo by Stuart C. Wilson - WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 01:  Queen Elizabeth II visits Goodenough College on December 1, 2016 in London, England. Goodenough College is the leading residential community for British and international postgraduate students studying in London.  (Photo by Stuart C. Wilson - WPA Pool/Getty Images)

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WINDSOR, ENGLAND - APRIL 21: Queen Elizabeth II meets well wishers on a walk about around Windsor on her 90th Birthday on April 21, 2016 in Windsor, England. (Photo by Samir Hussein/WireImage)

WINDSOR, ENGLAND - APRIL 21:  Queen Elizabeth II meets well wishers on a walk about around Windsor on her 90th Birthday on April 21, 2016 in Windsor, England.  (Photo by Samir Hussein/WireImage)

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LONDON, ENGLAND - DECEMBER 01: Queen Elizabeth II meets members of Goodenough College during a visit on December 1, 2016 in London, England. Goodenough College is the leading residential community for British and international postgraduate students studying in London. (Photo by Stuart C. Wilson - WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 01:  Queen Elizabeth II meets members of Goodenough College during a visit on December 1, 2016 in London, England.  Goodenough College is the leading residential community for British and international postgraduate students studying in London.  (Photo by Stuart C. Wilson - WPA Pool/Getty Images)