The concrete algorithm in Zhouyi ~ ~ ~

Take one out of 50. No need. (There are still 49. Then divide it into two parts, and then take one of the two parts and put it aside. These two points should add up to ***48, and then divide them by the remainder after 4. On one side is 1. If the other side must be 3, the other side must be 2. The other side must be 2. If there is nothing on one side, there is nothing on the other side. This puts the rest of the sides aside. Merge the two copies in hand), this is called Yi Yi, and then repeat the above process in brackets. Divide one minute by two and divide it by four. It's that simple. If you divide the rest by 4, you must get 6, 7, 8, 9, so you get a point. So it's easy to get a divination at eighteen.

Note: If the remainder is not 4, take out 4 pieces at the same time.