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when toggle format what by license comment
May 2, 2020 at 0:16 comment added tanghe2014 I am sorry for that because I don't know "flag or mak it as accepted answer". Now I understand how it works.
Oct 11, 2019 at 20:09 comment added QuantumDot Warning: This user does not mark any answers as accepted. Proceed with posting answers to this user's question with due vigilance.
Oct 9, 2019 at 7:54 history edited chris CC BY-SA 4.0
deleted 1 character in body
Oct 9, 2019 at 7:43 history edited chris CC BY-SA 4.0
added 18 characters in body; edited title
Oct 9, 2019 at 7:04 answer added Ulrich Neumann timeline score: 3
Oct 9, 2019 at 3:26 history asked tanghe2014 CC BY-SA 4.0