How to calculate fengshui 24 mountain 12 changshengkou?

Dingshan is in the square, in the four mountains of Ding, Xin, Gui and B, and the sand is born in the eight mountains of Geng, You, Ren, Zi, A, Mao, C and Wu. Sand mining is located in the four mountains of Shenhai Yin. In the afternoon, Sha was born in the four mountains of Kun, Gan, Gen and Xun. Wang Sha is in the eight mountains of Wu, Geng, You, Ren, Zi, Jia, Mao and C, and Fuguisha is in the four mountains of Wei, Xu, Chou and Chen.