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样例不懂的童子进来~【题意】：给出一个地图，标有X的地方不能经过，给出一对坐标，问这对坐标能否相连通，如果能则输出最少要经过的路段（路段是指一段直线，如果中途发生转折则就是两个路段）；如果不能则输出impossible。 Followed by:
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