The kind of excerpt-like thing you see on the end of many many modern URLs. "rare-white-moose-captured-on-film-in-sweden" in this one: www.bbc.com/news/av/world-europe-40918494/rare-white-moose-captured-on-film-in-sweden

It's machine-produced and surprisingly good at revealing accidental/unintentional/evil duplicates, considering how cheap it is.