tian周天宇's submissions for 1186 均方差

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tian周天宇
on Nov. 14, 2017, 4:04 p.m.
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tian周天宇
on Nov. 14, 2017, 4:03 p.m.
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tian周天宇
on Nov. 14, 2017, 4:03 p.m.
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