Sam Il
TF INTERNATIONAL TAEKWON-DO TECHNICAL SEMINAR by
Grandmaster Hwang Ho Yong, 9th Dan
23-26 OF SEPTEMBER 2013 Suzdal, Russia
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![Самая простая нерешённая задача — гипотеза Коллатца [Veritasium]](https://sun9-58.userapi.com/AooFjOGl1-XEHhwZNu0iF17j1HTqNDOZpymaHw/PUPAkjFU4Ag.jpg)
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