Hamamatsu (CNN) -- Sitting in an armchair next to his sister, in a cozy living room in the Japanese city of Hamamatsu, Iwao Hakamada looks like your average 83-year-old grandpa. But in 2014, he became the world's longest-serving death row inmate, after spending nearly five decades in a tiny, solitary cell waiting for the hangman's call. In

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