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I thought you might be interested in looking at Tiếng Việt : Dễ Mà Khó.
http://diendan.lyhoclacviet.vn/chu-de/16947-ti%E1%BA%BFng-vi%E1%BB%87t-d%E1%BB%85-m%C3%A0-kh%C3%B3/?do=findComment&comment=100975
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