A , is a form of Classical Chinese used in Japan from the Nara period to the mid-20th century. Much of Japanese literature was written in this style and it was the general writing style for official and intellectual works throughout the period. As a result, Sino-Japanese vocabulary makes up a large portion of the Japanese lexicon and much classical Chinese literature is accessible to Japanese readers in some semblance of the original. The corresponding system in Korean is "gugyeol" (口訣/구결).