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The benchmark Hang Seng Index was up 76.99 points, or 0.41 percent, to 19,019.22 in early trading.
The summit is due to be held in Brussels on Thursday and Friday.
The benchmark Hang Seng Index was up 76.99 points, or 0.41 percent, to 19,019.22 in early trading.
The summit is due to be held in Brussels on Thursday and Friday.