2. Flexible numbering method: write (report) three numbers at will, or write three Chinese characters (with regular strokes for each stroke), or randomly draw three playing cards. As long as it can be converted into numbers, the method can be designed at will and whatever comes to mind can be used. The method of selecting numbers by month, day and hour has great limitations in practical application. Just like many people apply for a visa at the same time, the method of getting the number by month, day and hour is powerless. Just as temporary flexible access can solve this problem, access is more flexible and convenient. After a lot of practice, the effect is excellent.