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trends timeline for %E3%83%92%E3%83%AB%E3%83%99%E3%83%AB%E3%83%88%E2%80%93%E3%83%9D%E3%83%AF%E3%83%B3%E3%82%AB%E3%83%AC%E7%B4%9A%E6%95%B0%20-%20Hilbert%E2%80%93Poincar%C3%A9%20series