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I just find out the answer on wikipedia, check this if you have the same problem with me. https://en.wikipedia.org/wiki/Descartes%27_theorem#math_1
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Project Euler #199: Iterative Circle Packing
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I just find out the answer on wikipedia, check this if you have the same problem with me. https://en.wikipedia.org/wiki/Descartes%27_theorem#math_1