Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Passage: Alaka mba asaa ahụ na-elekwasị anya n'ire ngwaahịa na ọrụ Leister. E nwere alaka na Aachen (Germany, kemgbe 1999), Itasca (USA, kemgbe 2000), Shanghai (China, kemgbe 2004), Chennai (India, kemgbe 2007), Osaka (Japan, kemgbe 2011), Houten (Netherlands, kemgbe 2012), na Milan (Italy, kemgbe 2013).  Ajụjụ: Ebee ka alaka ụlọ ọrụ Leister asaa dị n'ụwa?
Aachen (Germany, kemgbe 1999), Itasca (USA, kemgbe 2000), Shanghai (China, kemgbe 2004), Chennai (India, kemgbe 2007), Osaka (Japan, kemgbe 2011), Houten (Netherlands, kemgbe 2012), na Milan (Italy, kemgbe 2013)