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<!-- robots.txt points here. Regenerate the pages with build-learn-pages.py,
     then rerun the sitemap block — the two must stay in step.

     The storefront is ONE url: it switches views on the URL fragment
     (#catalog, #product/bpc157), and a fragment is not a separate URL to a
     crawler. The /learn/ pages are real files, which is the only way this site
     can rank for more than one query.

     Gated and link-only products must NEVER appear here, and never get a
     /learn/ page either. -->
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