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Ri Kyong Chol, left, and Sok Chol Won, right, professors from the Academy of Social Sciences, speak during an interview with the Associated Press, Thursday, Oct. 23, 2014, in Pyongyang, North Korea. The professors said the United States must make a formal apology to secure the freedom of two Americans who remain imprisoned in North Korea after the release this week of Jeffrey Fowle. (AP Photo/Wong Maye-E)