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https://phabricator.graviti.cn/w/graviti_algorithm/%E6%9C%BA%E5%99%A8%E5%AD%A6%E4%B9%A0%E7%AE%97%E6%B3%95%E8%AF%84%E4%BC%B0%E6%8C%87%E6%A0%87/2d%E7%9B%AE%E6%A0%87%E8%B7%9F%E8%B8%AA%E7%AE%97%E6%B3%95%E8%AF%84%E4%BC%B0%E6%8C%87%E6%A0%87/#aor-average-overlap-rate