In a north-south direction in accordance with things and is divided into regular city blocks, n a settlements scattered distributed in different neighborhoods. East-west coordinates with x, y said with a north-south. The location of the settlements can be coordinates (x, y) said. Blocks in any two points (x1, y1) and (x2, y2) can use the distance between the values | x1-x2 |+ | y1-y2 | metrics.

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