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A Yemeni man walks at a market in the old city of the capital Sanaa on October 21, 2016. / AFP / MOHAMMED HUWAIS (Photo credit should read MOHAMMED HUWAIS/AFP/Getty Images)

A Yemeni man walks at a market in the old city of the capital Sanaa on October 21, 2016. / AFP / MOHAMMED HUWAIS        (Photo credit should read MOHAMMED HUWAIS/AFP/Getty Images)