What are the artistic features of the calligraphy of Urgent Chapter in Song Dynasty?

The ink of the Song Dynasty's Urgent Chapter is now in the Palace Museum in Beijing, with a total of 1900 words. This was written by Song Ke at the age of 44, and it has a strange process. Cao Zhang was revived in the Yuan Dynasty. After Deng, Zhao Mengfu and Kanglizi Mountain, they are counted. The elegance of Cao Zhang, Song Ke can make up for the deficiency of Zishan, while its broadness eclipses Ziang. This ink was first collected by the great collectors in Ming Dynasty.

Born in Chang, Nanyang, Henan, Ren Mianyang Tongzhi. He is good at cursive writing, especially in Zhang Xu and Huai Su. He is elegant, skillful and charming, and his brushwork is charming, just like Wang Sui of Song Like and Song Ke.