The 21-page system of the Eight Character Nayin method is complete and the techniques are profound, and it is a rare advanced study material.

Geographic Profound Pearl Xia Shilong Ming Wanli 43rd Year

Yin Rutong’s “Kanyu Xuankong Dagua Profound Meaning Collection and Explanation” Volume 2

The Book of Stems and Branches—Analysis of the Most Profound Principles of Heavenly Stems and Earthly Branches Page 35

Ruoti Guyin: The Profound Meaning of the Six-Yao Xiangfa of Zen Ibumen Page 365

“Qimen Dunjia Qizheng Xingshu Profound Truth” Tamiya Kiyuki 318 pages PDF download

A Collection of Profound Meanings of Kanyu Xuankong’s Great Hexagram

Geographic Profound Pearl Xia Shilong Ming Wanli 43rd Year