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Dutch Minister of Foreign Affairs Bert Koenders (R) and Belgian Foreign Minister Didier Reynders (L) sign the Treaty Boundary Correction, at the Royal Palace in Amsterdam, on November 28, 2016 as (up,fromL) Belgium Queen Mathilde, King Philippe, Dutch King Willem-Alexander and Queen Maxima stand during the three-day state visit of the Belgium royal couple to the Netherlands. / AFP / ANP / Robin van Lonkhuijsen / Netherlands OUT (Photo credit should read ROBIN VAN LONKHUIJSEN/AFP/Getty Images)

Dutch Minister of Foreign Affairs Bert Koenders (R) and Belgian Foreign Minister Didier Reynders (L) sign the Treaty Boundary Correction, at the Royal Palace in Amsterdam, on November 28, 2016 as (up,fromL) Belgium Queen Mathilde, King Philippe, Dutch King Willem-Alexander and Queen Maxima stand during the three-day state visit of the Belgium royal couple to the Netherlands. / AFP / ANP / Robin van Lonkhuijsen / Netherlands OUT        (Photo credit should read ROBIN VAN LONKHUIJSEN/AFP/Getty Images)