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Ireland's President, Michael D Higgins (2nd R) and his wife Sabina (R), greet Britain's Prince Charles, Prince of Wales and his wife Britain's Camilla, Duchess of Cornwall at Aras an Uachtarain, the official residence of the President, in Pheonix Park, Dublin, on May 10, 2017. / AFP PHOTO / PAUL FAITH (Photo credit should read PAUL FAITH/AFP/Getty Images)

Ireland's President, Michael D Higgins (2nd R) and his wife Sabina (R), greet Britain's Prince Charles, Prince of Wales and his wife Britain's Camilla, Duchess of Cornwall at Aras an Uachtarain, the official residence of the President, in Pheonix Park, Dublin, on May 10, 2017. / AFP PHOTO / PAUL FAITH        (Photo credit should read PAUL FAITH/AFP/Getty Images)

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Ireland's President, Michael D Higgins (2nd L) and his wife Sabina (L) on the steps with Britain's Prince Charles, Prince of Wales (R) and his wife Britain's Camilla, Duchess of Cornwall at Aras an Uachtarain, the official residence of the President, in Pheonix Park, Dublin, on May 10, 2017. / AFP PHOTO / PAUL FAITH (Photo credit should read PAUL FAITH/AFP via Getty Images)

Ireland's President, Michael D Higgins (2nd L) and his wife Sabina (L) on the steps with Britain's Prince Charles, Prince of Wales (R) and his wife Britain's Camilla, Duchess of Cornwall at Aras an Uachtarain, the official residence of the President, in Pheonix Park, Dublin, on May 10, 2017. / AFP PHOTO / PAUL FAITH        (Photo credit should read PAUL FAITH/AFP via Getty Images)

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Ireland's President, Michael D Higgins (2nd L) and his wife Sabina (R) walk with Britain's Prince Charles, Prince of Wales (L) and his wife Britain's Camilla, Duchess of Cornwall in the gardens at Aras an Uachtarain, the official residence of the President, in Pheonix Park, Dublin, on May 10, 2017. / AFP PHOTO / PAUL FAITH (Photo credit should read PAUL FAITH/AFP via Getty Images)

Ireland's President, Michael D Higgins (2nd L) and his wife Sabina (R) walk with Britain's Prince Charles, Prince of Wales (L) and his wife Britain's Camilla, Duchess of Cornwall in the gardens at Aras an Uachtarain, the official residence of the President, in Pheonix Park, Dublin, on May 10, 2017. / AFP PHOTO / PAUL FAITH        (Photo credit should read PAUL FAITH/AFP via Getty Images)

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Britain's Prince Charles, Prince of Wales (L) and his wife Britain's Camilla, Duchess of Cornwall walk to their car after visiting Ireland's President, Michael D Higgins and his wife Sabina at Aras an Uachtarain, the official residence of the President, in Pheonix Park, Dublin, on May 10, 2017. / AFP PHOTO / PAUL FAITH (Photo credit should read PAUL FAITH/AFP via Getty Images)

Britain's Prince Charles, Prince of Wales (L) and his wife Britain's Camilla, Duchess of Cornwall walk to their car after visiting Ireland's President, Michael D Higgins  and his wife Sabina at Aras an Uachtarain, the official residence of the President, in Pheonix Park, Dublin, on May 10, 2017. / AFP PHOTO / PAUL FAITH        (Photo credit should read PAUL FAITH/AFP via Getty Images)

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Britain's Camilla, Duchess of Cornwall (R) arrives at at Aras an Uachtarain, the official residence of the President, in Pheonix Park, Dublin, on May 10, 2017, during a visit to Irish President Michael D Higgins and his wife Sabina. / AFP PHOTO / PAUL FAITH (Photo credit should read PAUL FAITH/AFP via Getty Images)

Britain's Camilla, Duchess of Cornwall (R) arrives at at Aras an Uachtarain, the official residence of the President, in Pheonix Park, Dublin, on May 10, 2017, during a visit to Irish President Michael D Higgins and his wife Sabina. / AFP PHOTO / PAUL FAITH        (Photo credit should read PAUL FAITH/AFP via Getty Images)