Calligraphy signature format 20 15 02 13 couplets written with brush.

A year is divided into four seasons (spring, summer, autumn and winter); A season has three months, the first month is called Meng, the second month is called Zhong, and the second month is called Ji. A month can be divided into middle and late periods, which can be written as "there is a Huan in the upper part, a Huan in the middle part and a Huan in the lower part". There is also a common way to write the word "Huan", which can't be typed here, so you can use Huan. So 12, 13, in May 2065438, I wrote a book in the midsummer of the year of Renchen.