I would like to give some feedback about ...

From: http://www.checkio.org/mission/find-friends/solve/

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I have some problems with result, when I try my code on this interpreter: http://www.codeskulptor.org/#user41_opBw18QCeS_0.py it give right result(true), but on the checkio it return false, which is not correct. Do you know what is problem, I think that this is bug.