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MUSCAT, OMAN - NOVEMBER 05: Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall leave the Al Bustan Palace Hotel to attend an official dinner on November 5, 2016 in Muscat, Oman. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain. (Photo by Arthur Edwards - Pool/Getty Images)

MUSCAT, OMAN - NOVEMBER 05: Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall leave the Al Bustan Palace Hotel to attend an official dinner on November 5, 2016 in Muscat, Oman. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain. (Photo by Arthur Edwards - Pool/Getty Images)

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MUSCAT, MUSCAT - NOVEMBER 05: Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall during a cultural welcome ceremony outside the Sultan's Palace on the second day of a Royal tour of Oman on November 5, 2016 in Muscat, Oman. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain. (Photo by Chris Jackson/Getty Images)

MUSCAT, MUSCAT - NOVEMBER 05:  Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall during a cultural welcome ceremony outside the Sultan's Palace on the second day of a Royal tour of Oman on November 5, 2016 in Muscat, Oman. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain.  (Photo by Chris Jackson/Getty Images)

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MUSCAT, OMAN - NOVEMBER 05: Camilla, Duchess of Cornwall visits Etab Al-Zadjali's cake business stand (the cake gallery) she attends a 'Woman in Business' event at the British Ambassador's Residence on the second day of a Royal tour of Oman on November 5, 2016 in Muscat, Oman. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain. (Photo by Chris Jackson/Getty Images)

MUSCAT, OMAN - NOVEMBER 05:  Camilla, Duchess of Cornwall visits Etab Al-Zadjali's cake business stand (the cake gallery)  she attends a 'Woman in Business' event at the British Ambassador's Residence on the second day of a Royal tour of Oman on November 5, 2016 in Muscat, Oman. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain.  (Photo by Chris Jackson/Getty Images)

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MUSCAT, MUSCAT - NOVEMBER 05: Camilla, Duchess of Cornwall visits the Oman Cancer Association on the second day of a Royal tour of Oman on November 5, 2016 in Muscat, Oman. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain. (Photo by Chris Jackson/Getty Images)

MUSCAT, MUSCAT - NOVEMBER 05:  Camilla, Duchess of Cornwall visits the Oman Cancer Association on the second day of a Royal tour of Oman on November 5, 2016 in Muscat, Oman. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain.  (Photo by Chris Jackson/Getty Images)

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MUSCAT, MUSCAT - NOVEMBER 05: Camilla, Duchess of Cornwall visits Etab Al-Zadjali's cake business stand (the cake gallery) she attends a 'Woman in Business' event at the British Ambassador's Residence on the second day of a Royal tour of Oman on November 5, 2016 in Muscat, Oman. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain. (Photo by Chris Jackson/Getty Images)

MUSCAT, MUSCAT - NOVEMBER 05:  Camilla, Duchess of Cornwall visits Etab Al-Zadjali's cake business stand (the cake gallery)  she attends a 'Woman in Business' event at the British Ambassador's Residence on the second day of a Royal tour of Oman on November 5, 2016 in Muscat, Oman. Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on a Royal tour of the Middle East starting with Oman, then the UAE and finally Bahrain.  (Photo by Chris Jackson/Getty Images)