After the basic and training courses in Ryusei Karatte, the final stage is the koryu course.
The koryu course is composed of four stages: Koryu san-kei (3 kata), Jyunishi, Kon (Bo) and Kai (eiku), and Okuden-I (full mastership).
http://www.chitokai.com.au/wp-content/uploads/2024/12/Koryu-Program_1-3_pdf.pdf