A hand flips through the pages of an open book. The book is on a table, and its pages are white with blue accents and dense blocks of Russian text. The pages rustle audibly as the hand turns them, revealing formulas and examples. The hand's fingers are visible in the lower-left corner of the frame. The final page reveals the title of the chapter, “Number systems”. The book’s pages lay flat, and the background is out of focus.

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