I hope this is not a misunderstanding of mine

I would like to give some feedback about ...

From: https://checkio.org/mission/x-o-referee/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:48.0) Gecko/20100101 Firefox/48.0

Dear team: I believe there is a problem with a particular combination of 'Os Xs' ; i don't have the same result than you i and i seems uncom=prehensible to me !

Maybe have you an explanation, am'i alone to, have this bug… ?

Thanks a lot for your answer

Stéphane ROBERT