http://nikaan.livejournal.com/ ([identity profile] nikaan.livejournal.com) wrote in [personal profile] avva 2017-09-15 09:03 am (UTC)

математики так делают. наверное, нельзя, но проблем ни у кого, насколько я знаю, не было. Издательствам лень проверять.
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