Original sentence: In his 1977 book on Wadō-ryū (published in English in 1997), Ōtsuka Sensei declared only nine official kata for Wadō-ryū:  Pinan Nidan, Pinan Shodan, Pinan Sandan, Pinan Yondan, Pinan Godan, Kūsankū, Naihanchi, Chintō, and Seishan
Edited sentence: In his 1977 book on Wadō-ryū (published in English in 1997), Ōtsuka Sensei declared only nine official kata for Wadō-ryū:  Pinan Shodan, Pinan Nidan, Pinan Sandan, Pinan Yondan, Pinan Godan, Kūsankū, Naihanchi, Chintō, and Seishan