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Reversing gains made in early morning trade, the Korea Composite Stock Price Index (KOSPI) finished down 1.2 percent at 1,983.74 points, its lowest closing level since Dec. 26.
Samsung Electronics, a chip and display supplier for Apple as well as a smartphone rival, ended down 2.6 percent, while LG Display, a key panel provider to Apple, fell 3.5 percent and chip maker SK Hynix slid 3.7 percent.