Question: Masakatsu Ueda is a MMA fighter who is a blue belt under the martial artist who teaches which two disciplines?
Related documents: [0]  [DOC] Masakatsu Ueda (born December 21, 1977) is a professional Japanese mixed martial artist who currently competes in the bantamweight division (known as featherweight in Shooto) for Shooto where he is the former Featherweight champion. Ueda won the vacant title after defeating Koetsu Okazai on March 28, 2008, by Unanimous Decision at Shooto's Back To Our Roots 8 show. Ueda was also a college level wrestler in Japan where holds a win over fellow mixed martial artist and Japanese Superstar Norifumi Yamamoto, better known as "Kid" Yamamoto. Ueda has also won many national titles in Combat Wrestling. He also won the All Japan Shooto Grappling championship, and both A and B class Shooto Rookie Tournaments. He is a blue belt in Brazilian Jiu-Jitsu under Yuki Nakai. [END] 
[1]  [DOC] Yuki Nakai (中井祐樹 , Nakai Yūki ) is a retired Japanese mixed martial artist and Shooter. He currently teaches shoot wrestling and jiu-jitsu, and is the president of the Japanese Confederation of Jiu-Jitsu. He competed in Shooto, a proto-MMA promotion; as well as Vale Tudo Japan 1995, where he was outweighed by every opponent in the tournament. Despite this, and despite suffering a severe eye injury in the first bout, Nakai managed to make it to the finals where he lost to Rickson Gracie. Nakai is a legend of Shooto by many fighters and fans. He is the founder of the Paraestra Shooto Gym and coaches fighters such as PRIDE and DREAM stand out Shinya Aoki, who also earned his A-Class Shoot wrestler's rank and his BJJ black belt from Nakai. [END] 
Answer: 
shoot wrestling and jiu-jitsu
shoot wrestling and jiu-jitsu