・ 音 カ
漢越音: khóa
Words 言 give the meaning and 果 (result) the sound: assignments given to check results, so it means lesson or section (Han Viet khoa, as in khoa hoc = course).
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今日は第五課を勉強します。 (きょうはだいごかをべんきょうします)
Today we will study Lesson 5.