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Works in test window

But throws an exception in the grader.

I would like to give some feedback about ...

From: http://www.checkio.org/mission/count-neighbours/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.124 Safari/537.36
  • feedback
Created: Oct. 7, 2014, 5:38 p.m.
Updated: Oct. 8, 2014, 4:27 a.m.
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