Edited sentence: All of the patterns start and end at the same location.Elements of the patterns may also be historical references, such as the number of moves, the diagram, the way the pattern ends, and so on.Its main functions are to coordinate and approve tournaments and seminars, set standards for teaching (patterns, sparring, destruction), collaborate with affiliated member organizations, and service members in regards to rank and certifications.Patterns, or teul (틀) in Korean, originally called hyeong (형), form an important aspect of training in Taekwon-Do.The International Taekwon-Do Federation was founded in March 22,1966 by General Choi Hong Hi (최홍희) in Seoul, Korea.The International Taekwon-Do Federation, or (ITF), exists to promote and encourage the growth of the Korean martial art of taekwondo.The majority of the patterns (except Yul-Gok, Ul-Ji and Tong-Il) start with a defensive move, which emphasizes taekwon-do's defensive nature.The names of these patterns typically refer either to events in Korean history or to important people in Korean history.There are 24 patterns in the official ITF syllabus; this is symbolic of the 24 hours in a day.They are equivalent to the kata in karate.This ensures that the practitioners' stances are the correct length, width, and in the proper direction