Sultan of Brunei Hassanal Bolkiah (L) and Singapore's Prime Minister Lee Hsien Loong pose with commemorative banknotes marking the 50th anniversary of the Brunei-Singapore currency interchangeability agreement at the Istana presidential palace in Singapore on July 5, 2017. Sultan Hassanal Bolkiah is in Singapore on a two-day state visit. / AFP PHOTO / ROSLAN RAHMAN (Photo credit should read ROSLAN RAHMAN/AFP/Getty Images)
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