http://khatskevich.livejournal.com/ ([identity profile] khatskevich.livejournal.com) wrote in [personal profile] potemki 2012-06-08 12:23 pm (UTC)

Тут используются некоторый ухищрения, и парные сравнения с последней перестановки и до 4:00 и есть эта самая проверка, насколько я вижу.
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