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题目给n个自上而下相连的正方形着黑色或白色.当n≤4时,在所有不同的着色方案中,黑色正方形互不相连的着色方案如图1所示:
The title gives n squares of black or white connected from top to bottom. When n ≤ 4, the coloring scheme of black squares that are not connected among all the different coloring schemes is as shown in FIG. 1: