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The HSI added 0.42 percent, or 128.07 points, to close at 30,451.27.
But the benchmark Shanghai Composite Index sank 1.43 percent, or 47.21 points, to 3,262.05 and the Shenzhen Composite Index, which tracks stocks on China's second exchange, was up 1.18 percent, or 20.18 points, to 1,734.57.