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b'Our correspondent walked the length of Hadrian\\u2019s Wall, in northern England, finding shifting party alliances and surprising views on Brexit. We take a look at the phenomenon of Japan\\u2019s hikikomori, who shut themselves in for years on end. And why a plague of rats in California is likely to get even worse. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/radiooffer

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