Hunminjeongeum · Sejong's Preface
HANGUL, The Cosmic Philosophy · p.38 / 428
ㅠ Yu[ju] is the medial vowel corresponding to the medial
sound of 슏 Syut meaning Dog.
ㅕ Yeo[jə] is the medial vowel corresponding to the
medial sound of 볃 Byeot meaning To Twist.
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