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Dayan Puzzles

Dayan Cube is a Chinese brand designed by Daqing Bao.  DaYan is the pinyin of his username "大烟头"(Da Yan Tou).  The logo on Dayan cube uses the last charactor "头". Dayan cube became popular worldwide soon after the invention, like Dayan Ⅱ guhong and DayanⅤ Zhanchi.