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This clip show the late Master Jan-Erik Lehn performing Twiyo Dwit Chagi, jumping back kick.Performed during a demo in Gyllenborghallen, Tromsø, Norway October 30. 1983. {youtube}TVRMtfWXH2s{/youtube}

This clip show the late Master Jan-Erik Lehn performing a downward knife hand strike.Performed during a demo under the national championship (NM) in Norway, 1984. {youtube}yd8WDdfp3Ks{/youtube}

Side piercing kick - Yop Cha Jirugi with the late Master Jan-Erik Lehn.Breaking a 10 cm Leca (Light Expanded Clay Aggregate) block.Performed during a demo in Gyllenborghallen, Tromsø, Norway in…