The Encyclopedia of Taekwon-do Patterns, Vol. 3
Volume 3 takes the senior student of Taekwon-Do from Choi-Yong (3rd Dan) to Tong-Il (6th Dan) and includes both Pyong-Hwa and Sun-Duk (required by the GTF), as well as featuring the first weapon form of Taekwon-Do: The Silla Knife Pattern.  --Back Cover