Question: Who reconstructed Middle Chinese spoken from the 7th century to the 10th century?
Sentence: This name first appears in Chinese characters as 土番 in the 7th century (Li Tai) and as 吐蕃 in the 10th-century (Old Book of Tang describing 608–609 emissaries from Tibetan King Namri Songtsen to Emperor Yang of Sui).
Answer in sentence: no