How to calculate the step distance of feng shui 13 of indoor stairs?

Stair steps? If you take 13 steps, the floor of this house will be more than 3 meters high. Generally, when you run the stairs, it is 1 1 step, and the height of one step is 12- 15 cm. Each floor is 2.9 meters. Except for the floor, it is 2.8 meters empty, and the stairs are generally single steps. That is1.3.7.9.1.13.17.19.21. Why? Because the number of days is 1.3.7.9, and the quota is the same. Why is there no five-step walk? Because five is called wuhuang, also called five ghosts, five ghosts are very suffocating in Feng Shui, do you understand?