Question: What is the name of the instructional film recorded by the trainer of Wan Kam Leung?
Context: The Rear Gunner is a 1943 American short instructional film, directed by Ray Enright and produced by Warner Brothers.  Previously, Warner Bros. had produced three short documentary films, "Winning Your Wings" (1942) starring Jimmy Stewart, "Men Of The Sky" (1942) and "Beyond the Line of Duty" (1942). Finding His Voice (1929) is a short film, created as an instructional film on how the Western Electric sound-on-film recording system worked.  Recording stars Billy Murray and Walter Scanlan, uncredited, provide the speaking and singing voices.  Murray also provided the voice for the Fleischer Studios character Bimbo. Wong Shun Leung (; 8 May 1935 – 28 January 1997) was a Chinese martial artist from Hong Kong who studied Wing Chun kung fu under Ip Man (葉問) and was credited with training Bruce Lee.  In interviews, Wong claimed to have won at least 60, and perhaps over 100, street fights against martial artists of various styles, though these numbers cannot be independently confirmed.  Due to his reputation, his students and admirers referred to him as 'Gong Sau Wong' (講手王 or 'King of Talking Hands').  Wong recorded one instructional film entitled "Wing Chun: The science of in-fighting". Dating Do's and Don'ts is a 1949 instructional film designed for American high schools, to teach adolescents basic dating skills, produced by Coronet Instructional Films and directed by Gilbert Altschul with the assistance of Reuben Hill, Research Professor of Family Life at the University of North Carolina.  In this film, the boy is the sole initiator of any contact with the girl, and all arrangements are made under the warm supervision of the family, particularly a mother who is a matriarchal housewife.  This film, as many of the other educational shorts of the post World War II era, denotes the traditional socially conservative values that were common in the early to mid 20th century.  His mother, as the film was released in the late 1940s, was raised during the end of the Victorian Era, in the 1910s or 1920s decade, supposing she is middle aged, where the custom of "courtship" was commonplace and is new to the "dating" concept, but she accepted it. National Film Award for Best Educational/Motivational/Instructional Film William Kwok (; born 1972) is a martial arts educator and promoter of martial arts education in America.  He is a disciple of Practical Wing Chun founder, Wan Kam Leung.  Kwok founded Martial Arts Studies International, an organization which promotes martial arts education and traditional martial arts culture.  China Central Television produced a documentary, “A Man and Wing Chun”, in which he was featured. Stop That Tank!  (aka Boys Anti-Tank Rifle) is a 22-minute 1942 instructional film created during World War II by Walt Disney Productions for the Directorate of Military Training, The Department of National Defence and the National Film Board of Canada (NFB).  Its purpose, akin to “edutainment”, was to instruct Canadian soldiers in the handling and care of the Boys Mk.1 Anti-tank rifle for use in combat against Nazi tanks.  The film presented information in an entertaining manner as well as providing an anti-Nazi propaganda message. Yau Kam Leung (, born 26 April 1985 in Hong Kong) is a professional football player who played in the Hong Kong First Division League for Fourway Rangers.  His position is Left-back. Hector the Cat (also known as Hector Cat, Hector the Road Safety Cat or simply Hector) is a fictional cat and mascot created to aid the teaching of road safety to children in Australia.  Educational material relating to the character was developed by the Australian Department of Transport in association with state and territory road authorities.  "Hector's road safety song" became well known in Australia when it was shown as a public service announcement on television.  The blue and yellow striped cat first appeared on a school calendar in 1971 with a storyline that he had lost eight of his nine lives due to "ignorance of road safety practices".  This was followed by a short instructional film.  In subsequent years other characters were introduced in calendars, instructional films, and comic books including Millie, his girlfriend (1973), Uncle Tom (1974), Hector and Millie's three kittens (1975) and his space friend Ding Dong (1982). Wan Kam Leung (; born 1945) is a Chinese martial artist and qigong practitioner who developed and currently teaches Practical Wing Chun in Kowloon, Hong Kong.  Wan studied Wing Chun kung fu under Wong Shun Leung
Answer: "Wing Chun: The science of in-fighting"