1, descendants of Sun Tzu's Art of War got to know Huang Shigong. After getting along, they appreciated Huang Shigong very much and gave him this book.
Jiang Taigong's descendants have been able to memorize this book. After meeting with Huang Shigong, they dictated this passage to Huang Shigong, who kept it in mind and copied it by hand afterwards.
Huang Shigong read this book by chance, and he never forgets it with his super memory. Afterwards, he made a copy himself.