This module contains data on the pronunciation of in the reconstruction of Old Chinese by Zhengzhang. See Wiktionary:About Proto-Sino-Tibetan § Reconstruction by Zhengzhang (2003) for more information.

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return {
	{ "1991", "單", "歌", "2", "嗁", "deːl", "見漢書" }, 
	{ "1992", "單", "歌", "2", "第", "deːls", "見漢書" }, 
	{ "2005", "單", "元", "1", "壇", "daːn", "爾雅鷒之音變" }, 
}