http://www.6nn6c.com/obs/20250401-llms-txt-one-year/ 2026-04-21T14:10:06+00:00 weekly 0.8 http://www.6nn6c.com/obs/20250310-doubao-crawling-pattern/ 2026-04-21T14:10:06+00:00 weekly 0.8 http://www.6nn6c.com/obs/20250220-google-sge-comparison/ 2026-04-21T14:10:06+00:00 weekly 0.8 http://www.6nn6c.com/obs/20250205-perplexity-source-diversity/ 2026-04-21T14:10:06+00:00 weekly 0.8 http://www.6nn6c.com/obs/20250115-baidu-snapshot-change/ 2026-04-21T14:10:06+00:00 weekly 0.8