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* 《大云轮请雨经》: 二合多上囉引瑟～二合转舌呼曩引誐囉引残散祖去引娜夜引

(translated) Mahāmegha-sūtra: phonetic transcription using Chinese characters, detailing pronunciation with terms like "diphthong", "retroflex tongue", and "elongated vowel"