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Thanks for the explanation.  It sort of makes sense.  But it looks distinctly odd to delete a link to some information and replace it with a ""citation needed"" tag.  As regards notability, certainly there is no evidence that S2 is notable enough to deserve its own article, and indeed it doesn't have a Wikipedia article.  But as far as I'm aware, it's not necessary to establish notability separately for each individual fact mentioned in an article.   "