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  "dek": "Nvidia is facing an unprecedented valuation test as a board inquiry into CEO Jensen Huang exposes the US chipmaker to a rare key-person risk, while investors also weigh the midterm elections’ potential impact on Washington’s chip controls and AI regulation. The company’s shares slumped 7.3 per cent as markets opened in",
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      "title": "Nvidia faces defining test as Jensen Huang probe adds to chip stock turbulence",
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    "Title-similarity clustering can miss differently worded or cross-language accounts and can join closely worded updates.",
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