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WINDSOR, UNITED KINGDOM - MAY 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II watches her hoses 'Lancer IV' & 'Tower Bridge' compete in the Four Year Old Hunter & Heavyweight Hunter classes as she attends day 1 of the Royal Windsor Horse Show in Home Park on May 8, 2019 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)

WINDSOR, UNITED KINGDOM - MAY 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II watches her hoses 'Lancer IV' & 'Tower Bridge' compete in the Four Year Old Hunter & Heavyweight Hunter classes as she attends day 1 of the Royal Windsor Horse Show in Home Park on May 8, 2019 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)