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when toggle format what by license comment
Apr 12, 2018 at 9:23 comment added Wenzhe The reference is very helpful.
Apr 12, 2018 at 9:22 vote accept Wenzhe
Apr 12, 2018 at 9:15 history edited François Brunault CC BY-SA 3.0
corrected some typos
Apr 12, 2018 at 9:07 history answered François Brunault CC BY-SA 3.0