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问答题
A postman delivers mail round a housing estate.
He does not want to visit the same street more than once, but can pass over the same street corners.
On which housing estate is this possible?
He does not want to visit the same street more than once, but can pass over the same street corners.
On which housing estate is this possible?
参考答案
参考解析
解析：
只有在第四个地图中邮递员可以不用走重复的路线即可把信送到。即先走外面圆形的路，再走中间三角形的路，反之亦然。但是其他三幅地图，邮递员必须要走重复的路线才可以把所有的信送达。
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