Explanation: Still made whenever necessary. Source: "Chi Sui one" when the system was desirable, and the Literary Diego used, should be of the order to pass the change, through change of the doctrine. "
No. 2
Still made timely. "Sui Shu Jing Ji Zhi 1": "when the system was appropriate, and the Literary Diego used should be of the order through change, through change of moderation."