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I have no idea why

the results were alright but it still reported fail!

From: http://www.checkio.org/mission/non-unique-elements/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (Windows NT 10.0; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0
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Created: Feb. 3, 2016, 12:13 p.m.
Updated: Feb. 6, 2016, 7:13 a.m.
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hoanghuy0910