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Above is cube, sudoku and nine series, such as cube, do not look much older students, playing five bands, seven bands cube too fast to keep up the level of a master, "wang weiyang school students in fourth-grade class, said:." I like sudoku can fill out a sense of accomplishment, but also flexible feel in solving a lot. "li yongqiang said, " play mathematics "is an important step in advancing the playing card manufacturers , customized playing cards.