Hard pen calligraphy formula

The rule for characters composed of "pu" and "na" is: if the "pu" is short, the "na" must be long; if the "pu" is long, the "na" must be raised. No matter what the circumstances, they cannot be written in the same length. The angles between the tilt and the vertical line are: the angle of the tilt should be small, and the angle of the tilt should be large.