• 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
Created at: Feb. 3, 2016, 12:13 p.m.; Updated at: Feb. 6, 2016, 7:13 a.m.