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Imagine there are skyscrapers of various heights (1<2<3...) hidden in the grid. The number keys beneath the grid indicate the different heights of the skyscraper. Each skyscraper height appears only once in every row and column. The numbers around the grid tell you how many buildings you could see from that vantage point in the corresponding row or column. - Keep in mind that higher buildings hide smaller ones! Link: more about Skyline-puzzles
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