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URL：http://1.bp.blogspot.com/-30-hIgchzqY/To6dGXsb2fI/AAAAAAAABMM/Pc9bnFrf5tE/s1600/O+and+ko.jpg 掲載元：http://carolineparkinson.blogspot.com/2011/10/learning-japanese-katakana-o-and-ko.html
