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Japan's Princess Mako (C) watches participants of an archery match at the Changlingmethang National Archery ground in Thimphu on June 3, 2017. Japan's Princess Mako, the oldest of Emperor Akihito's grandchildren, is on a nine-day official visit to Bhutan. / AFP PHOTO / Diptendu DUTTA (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)

Japan's Princess Mako (C) watches participants of an archery match at the Changlingmethang National Archery ground in Thimphu on June 3, 2017.
Japan's Princess Mako, the oldest of Emperor Akihito's grandchildren, is on a nine-day official visit to Bhutan. / AFP PHOTO / Diptendu DUTTA        (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)

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Japan's Princess Mako (C) throws a traditional dart called a khuru at the Changlingmethang National Archery ground in Thimphu on June 3, 2017. Japan's Princess Mako, the oldest of Emperor Akihito's grandchildren, is on a nine-day official visit to Bhutan. / AFP PHOTO / Diptendu DUTTA (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)

Japan's Princess Mako (C) throws a traditional dart called a khuru at the Changlingmethang National Archery ground in Thimphu on June 3, 2017.
Japan's Princess Mako, the oldest of Emperor Akihito's grandchildren, is on a nine-day official visit to Bhutan. / AFP PHOTO / Diptendu DUTTA        (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)

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Japan's Princess Mako (C) throws a traditional dart called a khuru at the Changlingmethang National Archery ground in Thimphu on June 3, 2017. Japan's Princess Mako, the oldest of Emperor Akihito's grandchildren, is on a nine-day official visit to Bhutan. / AFP PHOTO / Diptendu DUTTA (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)

Japan's Princess Mako (C) throws a traditional dart called a khuru at the Changlingmethang National Archery ground in Thimphu on June 3, 2017.
Japan's Princess Mako, the oldest of Emperor Akihito's grandchildren, is on a nine-day official visit to Bhutan. / AFP PHOTO / Diptendu DUTTA        (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)

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Japan's Princess Mako prepares to shoot an arrow at the Changlingmethang National Archery ground in Thimphu on June 3, 2017. Japan's Princess Mako, the oldest of Emperor Akihito's grandchildren, is on a nine-day official visit to Bhutan. / AFP PHOTO / Diptendu DUTTA (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)

Japan's Princess Mako prepares to shoot an arrow at the Changlingmethang National Archery ground in Thimphu on June 3, 2017.
Japan's Princess Mako, the oldest of Emperor Akihito's grandchildren, is on a nine-day official visit to Bhutan. / AFP PHOTO / Diptendu DUTTA        (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)

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Japan's Princess Mako (C) applauds participants in an archery match at the Changlingmethang National Archery ground in Thimphu on June 3, 2017. Japan's Princess Mako, the oldest of Emperor Akihito's grandchildren, is on a nine-day official visit to Bhutan. / AFP PHOTO / Diptendu DUTTA (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)

Japan's Princess Mako (C) applauds participants in an archery match at the Changlingmethang National Archery ground in Thimphu on June 3, 2017.
Japan's Princess Mako, the oldest of Emperor Akihito's grandchildren, is on a nine-day official visit to Bhutan. / AFP PHOTO / Diptendu DUTTA        (Photo credit should read DIPTENDU DUTTA/AFP/Getty Images)