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Mathematics teacher, GeoGebra community guy, GEOMATECH project hero, father of 3 kids, Android enthusiast, ... [b]t[/b]: [url]http://twitter.com/kobak[/url] [b]w[/b]: [url]http://kobak.org[/url] [b]f[/b]: [url]http://facebook.com/kobak[/url]
