천자문
The modern Uyghur linguist Abdurishid Yakup pointed out that the Turfan Uyghur Buddhists studied the Chinese language and used Chinese books like the "Thousand Character Classic" and "Qieyun" and it was written that "In Qocho city were more than fifty monasteries, all titles of which are granted by the emperors of the Tang dynasty, which keep many Buddhist texts as the Tripiṭaka, Tangyun, Yupuan, Jingyin etc."