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某小区的平面图如下图所示。快递员能否不经过重复的路走遍每家的门口?他是否可以从东南西北四个入口中任何一个入口进去,完成这一次投递路程?(提示:可以用“一笔画”来帮助解决)
A plot of the district as shown below. Courier can go through each door without repeating the road? He can enter from any of the four southeast northwest entrance, to complete this delivery? (Hint: you can use “one stroke ” to help solve)