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In page Taekwondo:

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The GTF and all three ITFs practice Choi's ITF-style Taekwondo. In ITF-style Taekwondo, the word used for "forms" is tul; the specific set of tul used by the ITF is called Chang Hon. Choi defined 24 Chang Hon tul. The names and symbolism of the Chang Hon tul refer to elements of Korean history, culture and religious philosophy. The GTF-variant of ITF practices an additional six tul.[citation needed]