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Theresa May, U.K. prime minister, left, stands next to King Salman bin Abdulaziz, Saudi Arabia's king, center, during their meeting at Al-Yamamah Palace in Riyadh, Saudi Arabia, on Wednesday, April 5, 2017. May plans to help Saudi Arabia lower its dependency on oil exports and increase the participation of women in the workforce as the Gulf kingdom seeks to modernize its economy. Photographer: Simon Dawson/Bloomberg via Getty Images

Theresa May, U.K. prime minister, left, stands next to King Salman bin Abdulaziz, Saudi Arabia's king, center, during their meeting at Al-Yamamah Palace in Riyadh, Saudi Arabia, on Wednesday, April 5, 2017. May plans to help Saudi Arabia lower its dependency on oil exports and increase the participation of women in the workforce as the Gulf kingdom seeks to modernize its economy. Photographer: Simon Dawson/Bloomberg via Getty Images

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Theresa May, U.K. prime minister, left, and King Salman bin Abdulaziz, Saudi Arabia's king, stand during their meeting at Al-Yamamah Palace in Riyadh, Saudi Arabia, on Wednesday, April 5, 2017. May plans to help Saudi Arabia lower its dependency on oil exports and increase the participation of women in the workforce as the Gulf kingdom seeks to modernize its economy. Photographer: Simon Dawson/Bloomberg via Getty Images

Theresa May, U.K. prime minister, left, and King Salman bin Abdulaziz, Saudi Arabia's king, stand during their meeting at Al-Yamamah Palace in Riyadh, Saudi Arabia, on Wednesday, April 5, 2017. May plans to help Saudi Arabia lower its dependency on oil exports and increase the participation of women in the workforce as the Gulf kingdom seeks to modernize its economy. Photographer: Simon Dawson/Bloomberg via Getty Images

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Theresa May, U.K. prime minister, left, speaks with King Salman bin Abdulaziz, Saudi Arabia's king, as they arrive for their meeting at Al-Yamamah Palace in Riyadh, Saudi Arabia, on Wednesday, April 5, 2017. May plans to help Saudi Arabia lower its dependency on oil exports and increase the participation of women in the workforce as the Gulf kingdom seeks to modernize its economy. Photographer: Simon Dawson/Bloomberg via Getty Images

Theresa May, U.K. prime minister, left, speaks with King Salman bin Abdulaziz, Saudi Arabia's king, as they arrive for their meeting at Al-Yamamah Palace in Riyadh, Saudi Arabia, on Wednesday, April 5, 2017. May plans to help Saudi Arabia lower its dependency on oil exports and increase the participation of women in the workforce as the Gulf kingdom seeks to modernize its economy. Photographer: Simon Dawson/Bloomberg via Getty Images

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Theresa May, U.K. prime minister, and King Salman bin Abdulaziz, Saudi Arabia's king during their meeting at Al-Yamamah Palace in Riyadh, Saudi Arabia, on Wednesday, April 5, 2017. May plans to help Saudi Arabia lower its dependency on oil exports and increase the participation of women in the workforce as the Gulf kingdom seeks to modernize its economy. Photographer: Simon Dawson/Bloomberg via Getty Images

Theresa May, U.K. prime minister, and King Salman bin Abdulaziz, Saudi Arabia's king during their meeting at Al-Yamamah Palace in Riyadh, Saudi Arabia, on Wednesday, April 5, 2017. May plans to help Saudi Arabia lower its dependency on oil exports and increase the participation of women in the workforce as the Gulf kingdom seeks to modernize its economy. Photographer: Simon Dawson/Bloomberg via Getty Images