File:The Spiral Chart (or the Square of Nine).jpg
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![File:The Spiral Chart (or the Square of Nine).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/25/The_Spiral_Chart_%28or_the_Square_of_Nine%29.jpg/600px-The_Spiral_Chart_%28or_the_Square_of_Nine%29.jpg?20180709162527)
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