With from without, hard showing from the difficult, short compare with long to define, Low showing from the high, Sound assort with the music, back come after the front, the rule is this.

• 有和无彼此相生，难与易的相互成就，长短也是相互比较而出，高下满盈相当，音和声相互协调而成，前后相随而韵。