Huai Su insisted on practicing calligraphy every minute, but Four Treasures of the Study was needed to practice calligraphy, but the temple was poor and empty. But it didn't bother Huai Su. He tried his best to grind ink and write every day until the board was worn out. If there is no special equipment, use local materials. As time goes on, the water in the pool is blackened by ink, so people call it Mo Chi.
I played by myself, so I can learn from it. I am very tired, so I beg to adopt it.
If you don't accept it, forget it, cut it and lie down.