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Ability and Possibility: -(으)ㄹ 줄 알다/모르다 https://www.morninglands.com/ability-possibility-%ec%9c%bc%e3%84%b9-%ec%a4%84-%ec%95%8c%eb%8b%a4%eb%aa%a8%eb%a5%b4%eb%8b%a4/