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when toggle format what by license comment
Sep 27, 2021 at 15:35 comment added Géry Ogam What are $S'$, $O'$ and $D'$?
Sep 26, 2016 at 15:52 history edited D.W. CC BY-SA 3.0
added 6 characters in body
Sep 26, 2016 at 11:01 history answered xavierm02 CC BY-SA 3.0