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Though neither had any running experience, they were given a chance by former world record holder Tegla Loroupe to earn selection for the Team of Refugee Olympic Athletes.
For the past few months, they have been training with 28 other runners in the famous Ngong Hills training area to find out if they will qualify.
ROA was set up by the International Olympic Committee in recognition of the worldwide refugee crisis.
Rebecca Nymal and Garkouth Puok Thiep fled conflict in southern Sudan, and found sanctuary in the world's largest refugee camp in Dadaab, Kenya.