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50 61.1% 55.6% 77.8% 5.6% 11. 5.6% 10 30 22.2% 30 40 ...la9.b.la9.jp/iogics/pdf/unneinews20190302011005.pdf50 61.1% 55.6% 77.8% 5.6% 11. 5.6% 10 30 22.2% 30 40 1% 20 33.3% 40 50 60

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