Link-spotting HOWTO

Rather than read through links by hand, it was more convenient to concatenate the HTML and run
lynx -dump
to get a list of links, then sort and uniquify these in Emacs, and run
wget --force-html -i FILE
to try downloading these things. Because the SocialMedia Classroom blocks non-registered users, those links show up as errors. M-x occur in Emacs is useful for collecting “dead links”, which I posted to

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