Contribute at least one answer each month for 6 consecutive months
Awarded to Kei Otsuka on 12 Mar 2018
3 of your answers have been accepted
Awarded to Kei Otsuka on 16 Sep 2017
Answer 1 question that was unanswered for more than 30 days
Awarded to Kei Otsuka on 20 Jul 2017
Provide your first answer ever to someone else's question
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