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SYDNEY, AUSTRALIA - NOVEMBER 02: King Willem-Alexander of the Netherlands (2nd right) and his wife Queen Maxima (4th left) sit next to Australian Prime Minister Malcolm Turnbull (3rd left) and his wife Lucy (right) and Governor General Peter Cosgrove (3rd right) and his wife Lady Cosgrove (4th right) during a concert at the Opera House in Sydney on November 02, 2016 in Sydney, Australia. The Dutch King and Queen are in Australia to commemorate the 400th anniversary of the landing of Dutch explorer Dirk Hartog in Western Australia. (Photo by David Moir - Pool/Getty Images)

SYDNEY, AUSTRALIA - NOVEMBER 02:  King Willem-Alexander of the Netherlands (2nd right) and his wife Queen Maxima (4th left) sit next to Australian Prime Minister Malcolm Turnbull (3rd left) and his wife Lucy (right) and Governor General Peter Cosgrove (3rd right) and his wife Lady Cosgrove (4th right) during a concert at the Opera House in Sydney on November 02, 2016 in Sydney, Australia. The Dutch King and Queen are in Australia to commemorate the 400th anniversary of the landing of Dutch explorer Dirk Hartog in Western Australia. (Photo by David Moir - Pool/Getty Images)