How to unregister AtCoder contest?

Правка en1, от Tiny, 2016-12-04 14:09:05

Maybe it's not appropriate to ask such question here, but I can't find the answer by google and don't know where to ask this question. Please don't downvote...
I registered AtCoder Beginner Contest, then I changed my mind and wanted to participate in Regular Contest, but couldn't find a way to register since I can't register both contests.
Does anyone know how to solve this? Thanks in advance.

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en1 Английский Tiny 2016-12-04 14:09:05 443 Initial revision (published)