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Dutch King Willem-Alexander (2nd L) and Queen Maxima (L) stand with Australia's Prime Minister Malcolm Turnbull (2nd R) and his wife Lucy at the MH17 Memorial at Parliament House in Canberra on November 2, 2016. The Dutch royals are in Australia to mark the 400th anniversary of explorer Dirk Hartog's landing in Western Australia and the unveiling of Hartog's plate, which is the oldest existing relic of European exploration in Australia / AFP / POOL / MICK TSIKAS (Photo credit should read MICK TSIKAS/AFP/Getty Images)

Dutch King Willem-Alexander (2nd L) and Queen Maxima (L) stand with Australia's Prime Minister Malcolm Turnbull (2nd R) and his wife Lucy at the MH17 Memorial at Parliament House in Canberra on November 2, 2016. 
The Dutch royals are in Australia to mark the 400th anniversary of explorer Dirk Hartog's landing in Western Australia and the unveiling of Hartog's plate, which is the oldest existing relic of European exploration in Australia / AFP / POOL / MICK TSIKAS        (Photo credit should read MICK TSIKAS/AFP/Getty Images)

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Dutch King Willem-Alexander and Queen Maxima place sunflowers at the MH17 Memorial at Parliament House in Canberra on November 2, 2016. The Dutch royals are in Australia to mark the 400th anniversary of explorer Dirk Hartog's landing in Western Australia and the unveiling of Hartog's plate, which is the oldest existing relic of European exploration in Australia / AFP / POOL / MICK TSIKAS (Photo credit should read MICK TSIKAS/AFP/Getty Images)

Dutch King Willem-Alexander and Queen Maxima place sunflowers at the MH17 Memorial at Parliament House in Canberra on November 2, 2016. 
The Dutch royals are in Australia to mark the 400th anniversary of explorer Dirk Hartog's landing in Western Australia and the unveiling of Hartog's plate, which is the oldest existing relic of European exploration in Australia / AFP / POOL / MICK TSIKAS        (Photo credit should read MICK TSIKAS/AFP/Getty Images)

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Dutch King Willem-Alexander (C) and Queen Maxima place poppies on the wall of rememberence during a visit to the Australian War Memorial in Canberra on November 2, 2016. The Dutch royals are in Australia to mark the 400th anniversary of explorer Dirk Hartog's landing in Western Australia and the unveiling of Hartog's plate, which is the oldest existing relic of European exploration in Australia. / AFP / POOL / MARK GRAHAM (Photo credit should read MARK GRAHAM/AFP/Getty Images)

Dutch King Willem-Alexander (C) and Queen Maxima place poppies on the wall of rememberence during a visit to the Australian War Memorial in Canberra on November 2, 2016. 
The Dutch royals are in Australia to mark the 400th anniversary of explorer Dirk Hartog's landing in Western Australia and the unveiling of Hartog's plate, which is the oldest existing relic of European exploration in Australia. / AFP / POOL / MARK GRAHAM        (Photo credit should read MARK GRAHAM/AFP/Getty Images)