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Yeap, I first noticed it when I was posting my witness updates, which have the same permalink. It's a common practice to add a unique id t the slug. Putting the id (4xvvgl, in this case) before the slug helps with search engines, or so I'd like to think.

It might be. The other trick is to finish the url with a unique numerical id...

This is a first time that I see the unique part added as a prefix, though.

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