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Bloomberg Best of the Year 2018: Mohammed bin Salman, Saudi Arabia's crown prince, arrives to meet Theresa May, U.K. prime minister, at number 10 Downing Street in London, U.K., on Wednesday, March 7, 2018. Photographer: Luke MacGregor/Bloomberg via Getty Images

Bloomberg Best of the Year 2018: Mohammed bin Salman, Saudi Arabia's crown prince, arrives to meet Theresa May, U.K. prime minister, at number 10 Downing Street in London, U.K., on Wednesday, March 7, 2018. Photographer: Luke MacGregor/Bloomberg via Getty Images