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Jul 27, 2018 at 4:29 vote accept Zurab Silagadze
Jul 26, 2018 at 21:34 history edited juan CC BY-SA 4.0
added 241 characters in body
Jul 26, 2018 at 18:52 comment added Carlo Beenakker it's eq. 27 of Sekatskii
Jul 26, 2018 at 16:46 history answered juan CC BY-SA 4.0