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<!--
  TEMPORARY. Retire this file around 2027-02-18 (roughly six months).

  Purpose: these are the legacy .html twins that Google indexed alongside the
  canonical extensionless URLs. sitemap.xml lists clean URLs only (correctly),
  so nothing in it ever points Google at a twin — meaning Google would only
  discover the new 301s whenever it happened to recrawl each twin on its own
  cadence, which at our traffic is weeks per URL.

  Submitting the old, now-redirecting URLs is Google's own documented method
  for accelerating a URL change: it uses the file to discover them, follows the
  301s, consolidates the signals and drops the twins.
  https://developers.google.com/search/docs/crawling-indexing/site-move-with-url-changes

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  redirect. That is this file working, not a defect. Do not "fix" it.

  Retiring this file is safe. Deleting _redirects is NOT — see that file.
-->
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